AK blind battle vs regular

[ig06]

Sorry if tl;dr!
strde635, with all due respect I think this is a gross oversimplification of a very difficult topic (3/4-betting).
My own view is that:
1) In total donk fest games, all sorts of players are 3-betting and 4-betting light and with little or no regard for opponent ranges (or on a hunch or whatever). A tight player can make a killing in such a game, by ensuring his 3- and 4-betting ranges and calling ranges are tight enough to crush those of his opponents.
2) In somewhat tougher games, players have learnt not to give money away so easily. Most players are usually not 3- betting or calling 3-bets/4-betting with non-premium hands except for the occasional bluff.
3) In a game such as 2, the correct adjustment is to widen your 3-betting/4-betting ranges to exploit tight players who will make incorrect folds pre-flop or on the flop. Of course you only make this adjustment against such players.
4) When a significant number of players are good/observant enough to understand this and to analyse/think effectively about 3 and 4-betting ranges against different types of opponent the games get tougher. The result is that the tight player who was crushing the donk fests in 1) and is routinely folding AK to significant pre-flop action from a good aggro player is now getting crushed. In contrast good players are 3-bet semi-bluffing and are felting AK as standard (against some players). Unfortunately, this has now filtered down to SSNL and there are far more tough regs doing this than there used to be.
Such is life but at any rate I don't think 5-bet pushing AK in a SB vs BB battle against an aggro opponent can be disregarded as terrible when (for reasons outlined above) its often pretty standard. Btw, obv if its a flip its hugely +EV to 5-bet all-in compared to folding (money already in pot). A quick calculation indicates we need 45% equity for a 5-bet push to be as good as folding.

With that said we started with eff stacks of >150BB deep and I tend to think its marginal and maybe a fold in this case. His 4-betting range can be pretty wide and still have too much equity if he is calling with all of it, e.g. 88-AA,AK,AQs has 56.65% equity. I think with these stacks sizes you need:
1) Him to have a pretty wide 4-betting range, ideally with some semi-bluffs like mid-pairs or AXs or whatever. Obv this needs a read based on history.
2) Him to be folding some of the pairs in that range (note that even 22-AA,AK,AQs has >55% equity against OP's hand).