The issue is systemic and not something they can fix without drastic changes, so the TTK is gonna be what it is until the game dies.
Mechs/armor/weapons were designed with random hit locations in mind. They then mostly ported all these values in to an FPS game that removes the random hit location part of the math, so of course everything fucking explodes instantly to a chest alpha because none of it was ever balanced for that to happen. A full alpha would hit like Larm, Larm, Rleg,Rtorso,Ctorso and splash all over the place, so it wasn't just getting cored out every time if you got ass-blasted by a big laser boat.
They've tried to bandaid this with laser burn times and gauss screenshake, but it doesn't matter. It's still true to target FPS with weapon damage numbers that will forever be a problem in that system.