"Warnings" are like the most difficult thing to 'send' though. If an app or service doesn't outright fail, warnings can be ignored. Even if not ignored... how do you properly inform? A compiler can spit out warnings to your terminal, sure. Test-runners can log warnings. An RPC service? There's no standard I'm aware of. And DNS! Probably even worse. "Yeah, your RRs are out of order but I sorted them for you." where would you put that?

Warnings are ignored. It's much better to fail fast.

The Python 3 community was famously divided on that matter, wrt Python 3. Now that it is over, most people on the "accept liberally" side of the fence have jumped sides.