A player who stretches the floor can also make a defense bend it's shape, just in different ways. They also force mismatches for guards, why the league has so many high ball screens, and they can help open driving lanes that until the last few years teams were figuring out how to close down on with these newer zone-like defenses.
Not that many slow-footed guys playing huge minutes now, but pulling out the slower ones and making them switch, or just getting a shot blocker to commit to leaving the rim, definitely aids in more benefits to your team than just making or missing a jumper.
Especially if a player is effective as a rim runner. Guys getting near max contracts from that alone in today's game. Receiving entry passes all game long with a defender camped behind you is a relatively predictable offense as well. If you can set a good ball screen, make the right roll, and the guard is a capable passer, you're not catching the ball with defenders set on you. You're catching the ball with an opening, with defenders scrambling.
I'm not sure what the exact value would be in a strictly back to the basket scorer in today's game. Would be hard to run the rest of your offense if 1-4 are switching all the screens. The player would almost have to draw double teams.