I don't care if it's in or out but I never take it out myself. When the rule was changed a few years ago, I never thought that I would want to putt with the flag in. But when COVID rules were in effect and the flags were left in the hole as a rule, I found that I didn't mind a bit if the flag were left in when I was putting. And if it saves 30 seconds taking the flag out each green, and 30 seconds putting it back in, that's 18 minutes a round.