Many people complain that there should not be a level-limit to anvils. However, I have never encountered this issue IF I’m using it properly. I have made the perfect armor / tools with all the best enchants multiple times (on vanilla), and if you combine the books in the correct order, you never reach the limit.
And not everyone know how to do smart combining or takes time to do the research, they just want to play the game.
Yeah, excuse me if I don’t want to go to https://iamcal.github.io/enchant-order/ every time I need to enchant a new pair of boots.