Do you have test results to support your premises?
Yes?
Play a game and fight the unbidden. They have 70 max range. Use KA battleship fleets with good tracking. You have 120+ range. I bias towards careful admirals, which boosts this to 144 range, nearly twice the enemy range.
I have fights where I take basically zero damage.
Do the same with autocannon fleets. They close to range, and don't all do it at once. So the enemy gets to fire on my fleets, and on the vanguard has a temporary force advantage.
When I have mixed fleets, my super-fast engage ships get chewed to pieces. They move fast and close within enemy fire range.
This is an extreme example - the unbidden have a design problem - but using them to illustrate the point is valid. The point is that with close ranged ships, even with overwealming firepower, you will take losses.
...
In any case, my point is that if evasion was a *defensive* feature instead of a debuff of the enemy attack ability, it would work better in the face of overwealming firepower.
If a ship with 50% evasion (after tracking) has a 50% chance to simply not get hit in a given time window, then having 1, 2, or 2000 ships shooting at it won't matter when it evades.
And if it takes 3 "evasion time windows" to close with the enemy fleet, at least 1/8 of such ships can make it through even an intense barrage.
As opposed to right now, where the barrage can completely wipe out the advancing force before they close.
In less intense environments it will help less, but it continue to help, especially against heavy weapons.