The difference is that the other player has not lost the ability to target the guy doing the jamming. Even if the jam lands (which, yes, is still RNG), he’s got the ability to at least fight back one of targets attacking him. That takes away the pain point. And while it’s binary, it’s binary in a one vs. one way that I think is acceptable to most players.
Thus, I think this change fixes the immediate problems with ECM.
Is it perfect? No. In a perfect world, there would be 20 clones of CCP Rise working together to redo the mechanic from the ground up. We don’t have that, so I’m okay with a small fix.