Rtfm and LMGTFY by themselves aren’t useful. They’re the equivalent of posting “me too”.
If you think that the answer is in the manual and they haven’t read it, post a link to the manual. Double helpful if you reference the section.
If you think the answer is on Google, I think we can assume everyone knows to try that first, so then no reply is needed. If it’s a particularly tricky search to phrase, maybe help with a link with a searchable phrase in it.
But not replying is always a useful thing to do if you’re not adding to the conversation.
I swapped out photoprism for immich and I’m much happier.