One difference is that human beings are much bigger and faster than in Naismith’s day. Moving the basket up to 11 feet (or more) would make it harder to score, especially from the inside, and bring in a little more balance with the outside game.
Moving the basket up to 11 feet (or more)
There was a pretty funny shoe commercial, during the 90’s, featuring “Grandpa” Shaq, explaining to the youngsters, how the game was, in the “olden days”, before movable baskets. They switch to a shot of a basketball game, where the baskets were robots, that ran around, and jumped up, and down, on the court, just like the players.
Always thought it was a “neat idea” :)