TTK would dramatically increase across the board for all PvP encounters
This is completely backwards, because Engineering has inflated defense far more than offense.
TTKs were, in general, significantly lower pre-Engineering.
Which would defeat the purpose in using a T9 in itself.
Imagine loading it up with top shields, and then M/HRPs and tanking it up and then leaving so little cargo space left after.
You can have a class 7 shield, two MRPs and four HRPs in a 606 ton cargo capacity T-9.
Of course, no one complained too loudly when they just cranked it up to 11 15, the ridiculous jump ranges, engine speed and firepower was too much fun.
Plenty of us complained quite loudly, it's just that most people want ever more, and sooner, irrespective of the consequences.
I don't think the balance issues of this game can be fixed without alienating a large percentage of the player base who put in hundreds of hours or more to make their ships perform just the way they wanted.
Any change means alienating someone, probably a lot of someones.
Having put G5 dirty drives on several of my favorite ships, I can never go back. If FDev nerfs anything, I'll forever be comparing the nerfed version with how it was when my ship builds were perfect. I have worked incredibly hard, for example, to set up my PvP Mamba; when it's done, all the resistances will be maxed and already it handles like a dream. I will be greatly displeased if that is taken from me.
My CMDR has almost 5500 G5 rolls and if I could click a button to revert the entire game to the state it was in, say, 1.3, I would, without hesitation. The ships I have now are freakish monstrosities that I have because they need to be competitive with other freakish monstrosities in a broad variety of tasks. The work I've put into Engineers doesn't make the end result more enjoyable than what I had long before Engineers, it's just required to be on the same footing.