Technically, this is a flop raise, but if and when there is a reason in PLO/PLO8 not to raise the flop (when it is dry, we are maybe protected, or it is so rich, even a set could see the turn first), then there can be the same reason in NLH against some players.
Waiting till turn to see like 2-6 (not a spade) or A or J, seems fine if he isn't going to pay off as much if any against a raise, anywhere. And with deeper stacks it would be more dangerous to raise on the flop, and it isn't that great even now (or you could fold, but top two isn't a hand one folds here in nlh 100 bb deep with some pot odds). If the turn comes with no blank card, I usually just call (like often in other forms); if I then lose it, it often saves me money, and maybe in cases I even can fold at some point compared to if much or all the money goes in on the flop. Maybe I get to raise the turn or river.
It depends on image also. It is not that I (and other players) regularly get to do raises with e.g. semi air (and there often is a better strategy, based on flop and the opponent, and the same with draws and solid hands), get called (they maybe c-bet too much, fold too much or I won't raise them as much) and hand shown and everyone seeing it, and even then, this opponent might know nothing other than he maybe sees from stats (and/or is used to see), if he has a flop check raise or raise stat. Why would he call your raise on the flop against your nuts and a couple of random draw combos that you occasionally raise (on tilt?).
Against an (unpredictable -- many draws here) aggro, I could play it the same. An aggro might keep betting and we have the position. And if we raise a tight or so player (and if he calls it rather than folds -- folds the flop or later if it comes all blanks even -- and moves to another hand), the turn or river will often not look good enough for him to pay off, so one is also hoping for blanks here (to get paid off perhaps, and the non blank could improve his hand). Though we have top two and he could have a lesser two pair, but maybe not. He needs to get pretty unlucky to have a pay off hand and it all coming blanks.
For balance, this isn't that good a bluff flop (either), when one does not so expect the opponent to fold, or fold on the flop, less so as he c-bet this flop, that also might be technique, but it doesn't mean it is the best play here. One can raise some strong draws or maybe losers that could win the showdown (or a combo) on the (select) turn (then not losing to some his draws and some weaker hands he can check call the river with. You might muck AK on the turn when you get raised there, that is not bad if expecting a river follow, and you are unlikely to check it on the turn too often), and some below call standard on the (select) river, for balance, if we have river value raises also.
Calling often makes more, than raising, and might be the safer path, and gives one a stronger call range. And how is one going to get value after he calls the flop raise, then the turn or/and river comes more or less dangerous? If it doesn't, and we just called the flop, we get the money anyway. And we can as so select our spot where we will raise, e.g. he could and should barrel some hands (maybe he even overbets a blank turn or river), and at some point we could decide that our hand is the best and raise, balanced with bluffs. He could later donk also, that is not possible with a lead.
At many levels many opponents don't stack off easy, as they should not if even the TAG players there tend not to have enough bluffs in their range (because of the opponents or just because), but if the flop and the opponent is right, if even then. You won't see enough of such bluffing in other forms either, if even in many higher games, the hands being even up to more solid/strong than at many lower levels, being like a super/turbo one table tournament where everyone and their dog tends to show an ace.
A
A
