The prime problem with ECM is that there’s no on-field counterplay.
Damps and TD can be mitigated by flying skill (move closer or minimise transversal).
Paint and web, in what I consider to be true Minmatar fashion, help apply damage to the target ship. They
don’t negatively affect the offensive abilities of the ship at all. A painted ship can shoot and target just as well as non-painted ship. Likewise true for a webbed ship.
As such, the counterplay is completely different to TD and Damps.
ECM has an effect on the targeting ability of the victim ship. But there’s no counter play. If you have a SeBo fitted, you put in an ECCM script and hope for the best. Piloting doesn’t really have an effect. You can technically fly out of range of ECM, but that usually adversely affects your ability to apply damage.
Further to this, with skills and rigs, ECM applies well way outside of weapon optimal, and ECM ships have the longest targeting range of ships of their size.
TLDR: ECM applies too far out for it to be solely a random chance of applies-fully/no-effect.