Even perfect A+ trade setups lose money and drain your confidence. Trading smaller on more frequent B+ and C+ setups instead preserves your mental edge and makes you more profitable overall.
Even A+ setups can turn into losing trades. I try to take only A+ setups. I wait for all the confluence, high timing analysis, following all my rules. So, oh, there's an A+ setup, I can finally enter it. But turns out it's a losing trade. And the reason is trading is about possibilities. You wait for so long and you got so much confidence, everything aligned to enter an A+ setup, turns into losing trade. It hurts your mental capital so much. That's why I find it actually entering with B+ setups and C+ setups with less position size is helping me make more money.