Agree with you 100%, but Tulip trees are becoming more popular, and they get big fast. I've dealt with a few that easily exceed what my 36" bar will cut in a single pass.Trees 4-5 feet at the stump are exceedingly rare around here... those 30-36" are rare... 20s are much more common but teens and smaller dominate.
I wish I could claim that I can make a straight line when starting from both sides (like my tree guy used to), but I am not nearly as good at it as he was.
Several years ago, I dropped a large Red Oak that had a bit of a lean in the wrong direction. It easily exceeded the length of my 36" bar, but I was glad I had that bar just the same as getting the hinge right was critical, and it was easier to do with a 36" bar than with a shorter one. I just thinned the sides of the tree a bit before felling it.
The Elm trees also used to get really big, but they are all gone (except some smaller ones that have not died yet).