This claim that the best writers write slowly is suspicious at best. Many of the best writers out there were prolific. And there are innumerable bad writers who barely write at all. Writing is an iterative process. I'm skeptical of advice about slowing down writing intentionally. I've found writing more and editing more improves my writing more than slower, more deliberate writing, particularly since it's less likely…
I also don't believe in this claim, or at least in it being a generally applicable thing. There's a point at which slowing down gives diminishing returns in my experience. I'm a music composer and I had to learn that the hard way. Sometimes my first ideas end up being good enough already, or even better than previous/future ideas that I had iterated a lot on. I also found that working for too long on a piece can pote…
Though it's also true that the last photo is also much more frequent. If I took 20 photos of something, I'd say I use either the first or last photo taken probably 1/3 of the time.