When your phone rings, it's a push notification of sorts. It is a real push notification if it's an OTP call.

Most people are not ok with missing incoming calls.

The phone app is the only one which I allow to have "push notifications". And they can be disabled. It's also the only one that I can think of that allows me to selectively enable based upon the sender (iOS user here).

I believe you can also allow Messages notifications in Do Not Disturb mode for your favourite contacts, if that's desirable for you

That's what I meant by "selectively enabled"

"What, someone rings you like a valet, and you rush to answer?"— French playwright Sacha Guitry, about the telephone.

You just described why millennials consider phone calls incredibly disruptive and rude (and I entirely agree with them despite being a Gen-Xer).

Voice calls are for emergencies.

I don’t let my phone ring except for one contact. People can wait.