Background:

So this is a question that I have been asking myself pretty often in a session as I can't really get my head around it. Consider this spot where we open with a PP and are confronted with a 3-bet.

Now in theory, many PPs are mixing when facing a 3-bet and being IP (let's just ignore that the 3-bet size is too large for the moment). For instance, this is Wizard's response vs. an optimal opponent. TT-55 are mixing, and 44-22 are pure calls unblocking the bluffing region.

Question:

However: What if we're facing an opponent that's obviously too tight? In this hand, MP played 15/12 with 3% 3bet over 178 hands. I can't quite get my head around whether

a) PPs overperform here since the 3-bettor's range is too strong. Hence, when we hit a set, we stack MP way more often than we should since he's lacking all kinds of folds once we hit a set. If we don't hit a set, we can just XF against a range that's too strong.

=> Adjustment: Medium PPs turn into a pure call

b) PPs underperform since a lot of their EV does not come from hitting sets, but bluffcatching on static runouts and checking down vs. broadway cards. This will obviously work poorly against a 3-betting range that's only comprised of the top 3% of hands.

=> Adjustment: Medium PPs turn into a pure fold

Which one of the two is it?