It depends on how many 3b bluff's you're going to have from UTG+2 vs a UTG raise and UTG+1 call. Probably not many, and 3b'ing a linear range is incorrect here.

Makes sense. From what positions in this situation would you be doing anything but flatting or is it too specific to table dynamics?Or if its vs all unknowns?

I know for me I am super unbalanced and would pretty much be 3! light almost never from anywhere but I guess there would be a better chance I would do it lp than ep. What do you think?

It's entirely table dependent, having a balanced line is never going to be wrong but if it's not reg vs reg then it's much better to take an exploitative one and 3b with a somewhat or even extremely unbalanced range. It's too specific to answer really, but if your game has a bunch of regs who are actually good and adjust and likely mention interesting hands they see to each other then your range is going to become something you'll have to worry about.

I think that particular KK/KK/QQ hand just demonstrates that UTG+2 is aware of his range and is adjusting appropriately for the fact that he is rarely if ever 3b bluffing there.

Ava is right about the UTG1 range tending to be very strong but the primary reason UTG2 didn't raise KK has nothing to do with range dynamics and everything to do with the fact your BB (their UTG) is the spot.

I never suggested that youre as likely to induce BB to 4 bet via a 3 bet (compared to induce BB 3b by flatting), but only pointing out that he actually has more 4 bets than he should given his propensity for overplaying/not fully being in tune with opponents ranges. I also think it's worth noting that specifically with AA, hero blocks chunks of a euro (non-German) LAGs traditional 3b range which unavoidably moves him more toward overcalls when we flat and potentially more flats/bluffs when we 3 bet.
I'm sure there are spots where a flat might approach the EV of 3 betting, but just not when a super passive fun player 7x opens btn no matter who is in the BB.

I dont think Avarita was talking about your comments, i think he was referring to Papagavin. Also, we are playing 5/10, making villains button open was 3.5x.