I was just thinking about this today. In a headsup pot (not HU play) where I raised preflop, and it's checked to me, I bet like 99.9% of hands. Obviously, in poker, you generally don't want to do the same thing EVERY time, but it seems to almost always be the optimal play in LO8. Either, you take down the pot from the c-bet, or you get called and re-evaluate, or get c/r-aised and re-evaluate for cheaper than it would be facing the same action on the turn, all in position, so you're in the driver seat to hit the gas or brakes.

Is this a leak? With all the hand possibilities with 4 cards, the only time where it seems like a huge problem is with stuff like unsuited high paired boards where it's likely I completely whiffed or hardly hit, and a smart player blindly check/raising in that situation is going to induce me to make a mistake. Kind of a catch-22, because those are also the pots you most want to take down right away because both your ranges lean weak and you don't want to give them something to confidently hang with on the turn. Though I guess you can counter that by calling down and seeing what kind of CRs you're facing and adjust accordingly.

Yes, it's a leak. Sometimes you will flop too much hand to bet-fold but not enough to bet-call (or more) comfortably. You should think about checking those hands and seeing some rivers and showdowns depending on your hand, the runout, the opponent, etc.

for starters, its a leak to c-bet 100% in limit holdem, probably more so in o8

I would disagree with that last bit, it's exploitable in LHE because you're going to flat out miss so much. Omaha 8 is a bit different, quite often I'm going to have "something" to continue with HU, someone check-raising liberally because of my aggression is going to be bleeding chips in a lot of spots.

Couldn't you still make the argument that you take down enough extra pots with that 100% c-bet that it's worth the difficult spots it will put you in? HU or 3 handed, I definitely lean more towards what you suggest.

There’s two main factors here (1) your just a big dog to their range in so many spots that c betting is jsut lighting money on fire but u see it all the time. Example you open A4KT and good player cold calls button. It comes 567, 678 etc and you are in a bad spot, why put more money it and
(2) backdoor equity, so many spots where we flop basically nothing but have lots of backdoor low/flush equity and we want to peel but certainly don’t want to call 2 bets or even get in 1 bet as a dog vs their range

1. If the cold caller is on the button, we're not in position. I am talking c-betting 100% of HU pots postflop in position. If the spots are switched, it's a very comfortable c-bet with A4KT in that spot, and if c/r'ed we can happily fold against a lot of players.

2. Headsup limit though, we don't really WANT to peel, we want to win the pot without peeling.

Not sure if this applies 100% but in the WSOP online PLO8 micro games there's a player who c-bets 100% of the time, whether he's in position or oop.

So I started auto-min raising him 100% of the time to see his reaction. Amazingly, he hasn't caught on and folds ~70% of the time.

I think with PLO8 you definitely have to be more selective with your c-bets because you can potentially be facing big bets from people playing back at you on the flop and future streets when you hold borderline hands. Worst case with limit, they play back at me, and I donk off 2.5 big bets making hero calls.

Yes it's a huge leak.

Are there opponents you should c-bet 100% of the time against? Yes. If someone c-bets 100% of the time heads up, can you exploit them by auto-checking to them on the flop? Yes.