First one is true and the devs have known about it for like months and months and still havent fixed so im guessing it's something netcode related thats currently unfeasible to remedy.
The second one, ehhhh. Matchups exist. Like 5 maybe 6 out of 22 characters can shake them off (Pocket, Viscous, Dynamo, Mo, Ivy, maybe Mirage iirc). Now its annoying sure but its not useless to plant bombs on them because of them having to waste good abilities to avoid the damage. If you're getting no stacks against them, simply dont lane against them, especially on solo. Plus you can build items like silence glyph and etc to guarantee they cant escape. Debuff remover sucks to go against but it means theyve spent 4250 and you can still self-bomb to use them