It rings, it flashes, it vibrates, it pops a message on the locked screen, it lights up the locked screen, it can provide an overlay, it can show it at the top, it makes a sound on my laptop, it makes a sound on my desktop, it does all of the above on my tablet it has got icons flashing jumping blah blah blah
I see four methods of notification here, the rest are either a variation of the popup or alerts on a device other than the phone. But supposing I counted them all, each seems to have its own use case and is presumably useful to somebody. It's not my place to question someone's desire to use one or all of them if he/she wished.
I'm with you, I don't like some of those notifications, so I do the same thing I hope you do: go to settings, turn them off, and continue the rest of my day.