I started learning GTO but there is an aspect that no one seems to address. I've been thinking about it , and i can't seem to figure out the answer.
GTO play is supposed to be a strategy with which you cannot lose , not matter how your opponent plays (right? did i get this wrong?)
You are supposed to bet and defend with certain frequencies , so if he plays optimal too no one makes money , but if he deviates he loses and you win.
But it seems to me that you can definitely lose by using gto if your opponent is too tight in some spots.
For example: against the standard button raiser the optimal 3bet range is something like 16% , and you have to shove 40% of this if you never call the 4bet - that range looks something like this KQs ATs+ AJo+ TT +
If your opponent is a 4bet nit and only 4bets AA KK , you lose a ton of money by shoving all those hands. How do you make up for this? If he defends the rest of his range just by calling the 3bet, it doesn't necessarily mean you make (enough) money postflop.
Another example could be when a someone 3bets KK+ and you defend with 4bets (because you're oop and don't call 3bets) 30% like you should , 60% of this being hands that call a 5bet and the rest bluffs. Again you lose a ton in this spot. Even if you would play heads up , it doesn't mean that you make up for the all in loses when you play postflop - since him being too tight in these spots doesn't automatically make you better at poker than him.
There are just extreme examples , but i'm sure you can lose with gto play even if the opponent is looser than that , but not loose enough.