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.
IMO the level cap makes sense if Mojang wants to keep players grinding for more materials to replace their gear. But, Minecraft just isn’t that kind of game to begin with. Plus, by the time it starts having that effect, grinding for materials just isn’t that big of a deal anymore.
Besides, replacing your broken gear doesn’t make for good gameplay anyway. It just distracts from building the big project you need the gear for.