If I recall the premise is that real life roads are not the perfectly smooth surface of a drum and the width and pressure maintains contact and rides more smoothly than a harsher narrower and higher pressure tire that bounce off the bumps.
Except for those competing, tires are usually a compromise for everyone else. Comfort, handling, durability, etc. all factor in since most of us don’t replace them monthly to maximize performance.
The bottom line, regardless of which side of the forever ongoing argument you are on, is to ride what you want. There are also psychological advantages to riding a tire you really like. I’m sure that on descents, improved body position would more than offset for perceived speed differences, but that doesn’t really matter.
The only problem with these threads are the passion in which some people feel a need to convince others that their position is correct. The problem with that is no one really cares who thinks what.
John