I'll add on here that Debuff Resistance is also reducing immunity to negative effects. After being affected by Silencer or Improved Burst, you're supposed to have immunity to the effect for some time, but Debuff Resistance is reducing that time as well.
Posting an example with Improved Burst, the Vindicta on the right has Debuff Remover, causing her to take damage from Improved Burst again earlier than the Vindicta on the left