Comment by rplnt

On the other hand, functional app returning http errors clouds your observability and can hide real errors. It's not always ideal for the client either. 404 specifically is bad. Do I have a wrong id, wrong address, is it actually 401/403, or is it just returned by something along the way? Code alone tells you nothing, might as well return 200 for a valid request that was correctly processed.

(devil's advocate, I use http codes :))