It is more complicated. If you can accept an always online / always connected model then you can guarantee more things because there is only one source of truth

It is more complicated. If you can accept an always online / always connected model then you can guarantee more things because there is only one source of truth (the server). The reason to care about local first is that even today, it’s hard to guarantee a server will always be connected and that model has some privacy and scalability challenges.