Ah, I'm sorry if I was mistaken, but it seemed to me too that you were saying it as if stating a fact and not an opinion. And I've seen a lot of experienced and professional authors say that they do not, in fact, plan everything that tightly before starting. Of course, there are also writers that do that. Either way, I don't think all professionals can be put under a single umbrella in such a way. After all, what works for one person might not work for another~
Hmm, maybe I'm misunderstanding something here, but I wouldn't call it positive to insist that writers can only successfully publish after properly planning things. As for execution, it isn't always dependant on planning. I've found that I, at least, execute ideas better when I don't exhaust my mind by planning every tiny detail beforehand
I think the point @yansusu is trying to make is that writers can create a story without planning everything, and then use rewriting and editing to polish it up by fixing all plotholes and the like before publishing. It doesn't have to start out being perfectly planned to come out being the best it can be
It was the exact opposite for me I started with very detailed planning of every small aspect of my story before realizing that it's better to give it some slack to turn into something more than I envisioned. I'm much happier with how it turned out now~ And the chapters the readers seem to have enjoyed the most are the ones I did impulsively with zero planning. It just seems to work for me that way