> Think microservices.

Microservices should already be a last resort when you’ve either: a) hit technical scale that necessitates it b) hit organizational complexity that necessitates it

Opting to introduce them sooner will almost certainly increase the complexity of your codebase prematurely (already a hallmark of LLM development).

> Better documentation

If this means reasoning as to why decisions are made then yes. If this means explaining the code then no - code is the best documentation. English is nowhere near as good at describing how to interface with computers.

Given how long gpt codex 5 has been out, there’s no way you’ve followed these practices for a reasonable enough time to consider them definitive (2 years at the least, likely much longer).