Have you worked at an organization without RFCs, ADRs, etc? The alternative is really just the wild west and whatever politics or pull a person has. RFCs and ADRs are good in the sense that they document _something_ even if the document is junk it's better than an assumption.
Really though it's the organization (and people) that makes or breaks anything.
I generally agree that it's better than nothing. That said, it's possible that sometimes these processes become bureaucratic shields for avoiding certain processes.
For example, a broken RFC process might be a way not to actually involve and gain useful consensus from people (I.e., I did my presentation during the weekly session, nobody had feedback), which instead would be the natural way in a company without that process.
100% agree that it's all about the people (and the culture shaped by them).
Really though it's the organization (and people) that makes or breaks anything.