Risking half your stack on every trade is obviously stupid
But risking too little on A+ setups is almost as bad
I see lots of guys who risk the exact same % of their portfolios on every trade
But fixed position sizing leaves edge on the table and limits your opportunities to make money
Whereas variable position sizing allows you to go heavy when you have aces in the hole
Nothing wrong with risking more on highly asymmetric bets or setups that tick all your boxes for an A+ trade
The skill is in recognising which setups deserve the higher risk