BDK

BDK is a tool that you can use to make wallets. It's the same software, same library. You're not rewriting the library or even using different features. With BDK and mini-script in general, you just learn that and then you're basically done for at least for on-chain development on Bitcoin. So yeah, I think it goes a lot further than just a wallet app, which is probably going to be the main thing.