Either you will have complexity maintaining a bunch of endpoints, keeping track of where each one is used, what is returned, where the contracts are defined, writing tests to make sure nothing breaks, .... Sure, you might not have much abstraction and it will be cleaner that way, but it will be a nightmare to maintain, especially in the phase when you are moving fast and breaking things as you find market fit
Or you can rely on heavy abstraction and code generation with end to end type safety so if you change something you instantly know if you broke anything at compile/deploy time (or earlier).
Something about building this way is really nice, and quite different than anything else. Personally, i'm betting big on code gen. If coding behind layers of abstractions make you uncomfortable, whats coming down the pipeline is going to be giving you nightmares (https://twitter.com/hrishioa/status/1748346491528532344)