Generally I just don't appreciate when someone jumps from "I care about this" to "everyone cares about this for obvious reasons." Focus on what something means to you, and being sincere about it. But that is just my advice for writing, take it or leave it.

Also, are browser text area inputs monospaced by default for everyone? Or did I configure that for myself long ago and forget? If it's not just me, maybe the "reasons" you're alluding to are not so obvious. Anyway, I have no trouble at all reading the long comments I type into text areas.

And more power to people for embracing agency :)