I'm not a huge fan of instant kill mechanics in the first place. I think they should be punishing, but not crippling.

At least I feel that way about instant kills in non-endgame fights. In the true badass boss fights at the ends of coils or tops of towers or whatever, yes. Instant kill mechanics. The bosses leading up to those badass fights should have lower-level versions of those mechanics that are less punishing, in order to prep you for the instant-kills in the final bosses.

I've done t6, and honestly the instant-kill bouquet was never something I particularly worried about... Except when it happened to me randomly when I literally wasn't doing anything at all. Or if I wasn't paying attention. :P Anyway, I think it's a good idea to "Dumb this down". As for the nerf in t7, I'm fine with petrification no longer one-shotting you (For already stated reasons) but the rest seems like kind of a cop-out. I've never made attempts on 8 so I can't comment on that.