I think all experienced balatro players have that learning moment of regret/I'm an idiot when they have the reroll boss for 10$ voucher and get countered anyways by the final ante 8 boss. Simply because they were rushing and didn't read the boss effect that perfectly counters them. No worse feeling knowing you lost because you didnt take two seconds to read some words and hit the reroll button.

After that you learn to check the boss blind descriptions more ahead of time and the reroll voucher goes from mid that you don't think of using to game saving