Cashout doesn't remove variance, but it lowers it a lot. Variance itself is good, it's the only reason that makes poker profitable. More variance, more edge, more value. Cashout doesn't affect opponent's variance, so it doesn't hurt the games imo. If it was normal table, it definitely would affect the dynamics and meta as it affects possible stack sizes. In fast poker, especially when you can rathole and reset stack back to 100bb at any time, it doesn't.
I have said that poker players in general underestimate mental game and I stand by it. I have seen it so often in the tables and even in streams. We all have our thresholds when things start to affect our game. And on my experience, most of players (not talking about just pro's) overestimate their abilities in mental game. Pro's are different, as they wouldn't probably be pro's in modern PLO if they had significant mental game leaks.
And it's not just poker. I also see in every day life, people think they can decide their emotions. Most of us have even fell for that trap ourselves. Example of getting angry. How many of us have decided "not to get angry of something"? Or if you have said or done something you regret, you decided not to do that again? But still it happens and you regret why did you do it again? We can't really decide our emotions. If you are sad, you can't decide not to be. You can mask it and pretend you are not, or you can think positive stuff and therefore lower your sadness. Same thing in all sport, including poker. If something makes you upset or angry, you can't just decide not to be. You can work on your emotional skills, but it's a long journey.
If you think that there is a person on this planet, who doesn't have mental game threshold, you are wrong. 100% of poker players will drop from A game at some point. Poker is also very delicate game, the cost of one bad decision often enough can have a huge impact on our winrate. One call based on emotions instead of rational logic can be -30 to -50bb on the river. Now we come to pure math. I estimate that cashout can prevent me from making feeling based errors on sessions where I run really bad. In a 3k hand session the cashout might cost 20-30bb. It wouldn't have to prevent that many mistakes to become actually +EV investment.
The thing that amazes me is how strong some people react to it. I understand your point of view. Not sure if you understand mine. You can disagree with my reasoning, and it's all good. If paying few bucks for cashout makes me happier, so what? I also drink soda and energy drinks when I play, and they probably cost more than cashout. No one complains about them.
And to clarify, I haven't threw anyone under the bus. I am just saying, that most people underestimate the importance of mental game. I could actually write a longer post about performance level and what affects it and how it affects our EV. But here is my favorite example:
John plays PLO, and plays it well. His winrate is +5bb/100. When he plays for 1K hand session, his EV is 50bb. Sometimes he gets annoyed if opponent plays bad and wins the pot or sucks out on him. Then he makes an aggressive move "to show him who's the boss". John tries to win a pot with bluffing, cos he wants to. Not thinking about strategy that much. He also cools down quickly, so he thinks it's not a big problem. But if John makes one bad bluff (each worth of -20bb) three times in a session, his winrate drops below zero. He played 997 hands well, and thinks that it's not a big deal to spew couple times in a long session. It's part of the game, as they say.
In reality poker is far from that simple. In classic mental game thinking we divide our performance level to A, B and C game. There are no such things, our performance level is constantly changing and it's affect on our EV is affected by a lot of things outside our influence. We also have feelings 100% of times. And we can't choose or directly control them. Every feeling also affects our ability to use rational thinking. I have hear so often players say that "yeah it upsets me but I won't let that affect my game" which just means they don't understand how feelings and rational thinking are linked, and they over estimate their mental game skills. It might not affect a lot, but having a feeling WILL affect the game. Often we don't recognize it or we are subconsciously blind to it. Or the effect is so little it doesn't affect EV at all. But saying "my feelings won't affect my game" is just bullshit.
So the real EV in the end is combination of ourself and variance (not just poker variance). Every human being is different, and we all have different emotional skills and self control abilities. I have talked with a LOT of players, and there aren't many who had viewed mental game in a depth and perspective it should be imo. Most of them have thought mental game as tilting, and if they don't tilt they don't have a mental game flaws. Some have even thought that tilting is part of the game that you can't remove.
So in the end, I estimate that using cashout at certain times is a good investment. I understand why most people won't use it. And I don't really advice anyone to use it, unless they really understand the cost and effect, and how it links to their game. But I would also ask that even if you don't use it, please respect my point of view. My cashout doesn't hurt you nor the games, so wouldn't it be just up to me to use it or not?