It can matter to some publishers. I had two different editors try to edit my first two submitted books down to under 600 pages. They wanted it under that length and they were perfectly willing to hack both books well beyond a point where I was okay with it to get that. One of them told me to split my one novel into 3 books and they'd consider publishing it. They wanted me to take a 1300 page book, which was not meant to be 3 books, and make it 3 books under 600 pages per book. So basically to please them I had to go and write more, then split it how they wanted, and even then they didn't actually publish. They optioned it, paid me a grand to do that, held onto it for 2 years, then dropped it and gave it back to me. Second publisher, same shit. This was a much shorter book, like 800 pages, but they still wanted me to trim it to under 550 pages and incidentally kill off a major character that they didn't like. They asked me to write a whole new one to take his place and switch the POV strictly to the female position. They told me if I'd do all that they'd consider optioning it. I told them no. After the first experience I was not going down that road again. They don't give you anything hardly but you can't sell it to anyone else while they option it. Uhuh, learned that lesson. Never again....