On one project, I actually shifted quite recently from working on old-school, pre-Windows XP, DCOM-based protocols, to interfacing with REST APIs. Let me tell you this: compared to OpenAPI tooling, DCOM is a paradise.

I have no first clue how anyone does anything with OpenAPI. Just about every tool I tried to turn OpenAPI specs into C or C++ code, or documentation, is horribly broken. And this isn't me "holding it wrong" - in each case, I found GitHub issues about those same failures, submitted months or years ago, and still open, on supposedly widely-used and actively maintained projects...