This is unnecessarily combative. Local-first does not mean local-only, it means that the app should also work on the internet, meaning that you need to solve sy

This is unnecessarily combative. Local-first does not mean local-only, it means that the app should also work on the internet, meaning that you need to solve sync, which is why it took some time for the concept to gain traction. CRDTs for example are relatively new.