First, I think the difference between invulnerable and not invulnerable can be called a change. (And let's not forget the fact that it wasn't invulnerable in the first place since its accumulator could be drained.)
Second, it's been like that for almost 2 months and noone said a thing. Quite the contrary actually, some people even said that the hit size reduction bonus is useless and it would have to be more prominent to have an effect.
But let's see:
Basic robotics lvl 10, the T4P evasive module, and the evasive nexus at lvl 10 brings 3 down to 0.25, that's correct.
What can you use against that beyond draining its energy:
* Any light laser's hit dispersion is 3
* Precision firing lvl 10 makes that 3*(1-(10*0.03))=2.1
* T4 weapon stabilizer brings that down by 15% to 1.78 (using 2 means 1.52, and using 3 means 1.29)
1.78 dispersion against a 0.25 hit size means ~0.14, which is a 14% chance to hit (16% with 2 stabs, 19% with 3). (Or in other words: every 7th (6th, 5th) shot hits on average.)
That's for a robot which has been designed to have evasion as its main defense.
ps. I realize there is a discrepancy between modules and extensions modifying turret dispersion and hit size, some using linear reduction, and some being percentage-based. They should be made consistent either way.