1) Thats the whole point to invest money to be stronger, thats the point of MOBA games. You get the lead by money and thats how you become more powerful. Take into example fed Haze which one shots whole team with one ulti in 1-2 secs, or Abrams which can tank 1v6 and win if he is fed. But in equal scenarios everything should be counterable, otherwise it will create disbalance. Disbalance leads to some heroes being OP, some weak.
Also, one more point is that each hero can be played in different ways, you can empower some abilities, go full Weapon Damage, more sustain, etc. Having variations is crucial for a MOBA game or it will be DOTA-like meta driven item build game, which is now a huge problem there.
2) It can grant spirit penetration bonus for a short time. (i.e Silencing Bullets grant silencing effect to all bullets for short duration)
3) It is what minus Spirit Resist on Spirit Damage (will refer as SPSD) means (Escalating Exposure has it).
4) It has -15% SPSD and 6% Spirit Damage Amp for every Spirit Damage tick. Its very OP for characters with continuous ability damage, but why won't you complain? I suggested an analog item, but for non-continous damage abilities.
5) I mean that's the whole point you buy counter items to what others buy. Will you say Metal Skin is OP because it negates Haze's ultimate ability? Thats exxagerating from your side to mean it. All items are broken then, because they give advantages and can negate enemies abilities and items.
6) Devs are devs, we are players

Devs are making 3D MOBA shooter game. This point is misleading.
7) Then you do not want to play at all, every hero is "pesky". As I said, it's MOBA game, any hero can be OP if he has more souls than others. Also, adding one of suggested items won't create one-shot from afar plays. The job of Grey Talon is to deal burst damage, you're right. But he cannot do his role well enough if he is countered without any anti-counter option, that makes him useless.
1) its not whole point, and its not only moba. You have TEAM (6x6 situation) arcade shooter with moba elements. You invest money and you get stronger, like your opponents. Haze is only killing people if they make a mistake or not build against her, seven has better winrates over all. He can perma stun people with certain build. You can cut down heal to 100% with certain items, so abrams is same as haze, his only real strong suite is stun and unstoppable on ult. Disbalance is this discussion is nullifying resistances beyond base (around 15%) point, of which people stack on its own, build base armor, or have innate resistance. Exposure just increasing your damage after resistances on proc. (base frequency is 0.7s, you can only get 3 procs within 2.1 secs without cd reduction item which is just 18% more damage after resistances, on target that has stacked exposure, which is balanced mostly) Current meta does not favor anything beyond lifestealing skirmisher(guy with low cd, who can go out and in fights often) or tanky cc dispenser due to items designs. This game fully balanced around items and map objectives, so heroes in game is not so important. Dota problem is that it is finished product and they have to have audince involved in game, so they make everything more complex and layered without regard to balance for the most part, then try to balance it. Every studio does it when they get polished and ready idea, they dont build anything themselves on it.
2)At best it should give damage amp on last target hit buy your bullet damage or previous spirit damage.
3)exposure has it because of component, having 2 of those components will allow to disregard base spirit armor for little price.
4)Its not as op as you think, as you can kill your opponent before he stacked atleast 30% of amp damage which will require 3 seconds of time and item procs with spirit damage. Also it amplifies damage after resistances and only on target with stacks.
5)True that but metal skin is not op, as bullet damage have superiority over spirit damage, it is needed, due to certain heroes in the game. Items should help negating damage or dealing it, while your proposal is to add more items to decrease resistances. Which is not done from the start on purpose. You may be able to counter people abilites or items (exposure or alchemical fire or crippling headshot, etc) but not ignore them.
If we add more resistance cutting items they will become mandatory to certain heroes as armors with them, making shields less desired option. And that might tip the balance and make it more spell oriented game.
6)I meant that they balance around items, and they do not want people to get two tier 4 items from 13k souls, which would be optimal if we didnt have robust item system in which you can benefit all the same from opposite category of items, and innate bonuses are still applicable whatever your hero is.
7) your standpoint is biased and come from traditional moba view. It is not. Game made to get people into melee / medium range of fights. Sniping from afar or poking far away isnt as easy and not really possible right now. (high range spell spam is not as strong as in moba games).
Snowballing in this game is also fully on player since its shooter. People can still cc you as team if you go spirit build, if you go bullet build you have to hit everything and be careful since you are glass cannon. Bruiser(lifesteal or high hp build) is countered by regen cuts and movement disables. Grey talon design is just bad. Deal with it. He doesnt have snowball or mage aspect as vindicta. He isnt getting much from bullet damage. Spammable 500 damage shot from high range is well enough in my opinion. Aoe 400 damage execute is also well enough to exist. His trap doesnt fit in there. His flight for bullet damage build, but he isnt getting damage benefits, only position wise benefits from it.
Your whole argument is that you want an item to make grey talon viable, but even if it happens. He is gonna just be one of many item abusers, also not the best of them. And that item is not gonna solve his identity problem, he is not fully a mage or bullet based hero.
Now imagine vindicta with this item, or even better infernus, seven, etc. Right now this item gonna break the game. i do not want it.