Most mountains are actually mountains on a mountain which is where the idea of prominence started. People wanted to know the elevation of a mountain relative to the land around it. So look at places like Tahoe, Reno, or Colorado...they have a bunch of 10,000+ft mountains but these cities themselves are already sitting at 4,000ft elevation. Personally, I think it’s a retarded metric. Altitude is altitude. The only thing it changes is how big the mountain appears