Just noticed that , apparently if the bob warfare plasma turret is in the game all units and spawners now get 90% plasma damage reduction.
I get that that helps make that turret much much weaker.

But it also has the sideffect of making the endgame ammo of both rampant arsenal and bobs warfare useless , since both are plasma ammo.
If anything id suggest making either that immunity toggelable or just straight up nerfing the turret if that is something apparently neccecary for the mod.

As it is currently it makes it so there's no point in ever trying to get to the most expensive lategame ammo

90% resistance in six factions out of 12 ("laser", "electric", "regenerative", "suicide", "nuclear", "energy-thief")
Everyone else at level 10 will have 70%
It was given to them , because plasma turret hits the area and is capable of single-handedly destroying any number of biters. In addition, the plasma turret has three types of damage at the same time and the biters almost always have a weakness to one of them

Even weakened by 10 times, it is very effective, but it needs support in the form of rapid-fire turrets. This is done specifically so that the player does not place only one type of turret, but puts effort into planning the defense.

The situation is similar with sniper turrets. You can't make a defense that consumes virtually no ammunition. At least that's how it's intended

If you have the Rampant Arsenal mod installed, I recommend supplementing your defense with missiles or capsules with poisonous area damage
Both Bob's ammo-turrets of high modifications and Mk2 turrets from the Rampant Arsenal are suitable as rapid-fire turrets. However, even vanilla ammo-turrets with damage research are suitable, unless you try to fight back with them alone

That is strange?
My game must have been bugged then, because in my game EVERYTHING had 90% plasma defense, even basic tier 1 small common biters including all of the buildings as well

I guess I need your save then
It is quite possible that the biters is changed some other mod
So, for example, at one time mod "Natural Evolution Enemies" made biters completely invulnerable