I believe the reasoning goes, Chrome isn't processor limited. Spotify isn't processor limited. Etc...

The use for multi core at performance is rare, I'm potentially writing a program for the first time in my life that uses parallel processing. The goal is to run this program a few times a year. No one would be buying a processor for me. They buy a computer for CAD guys, video card priority, ram, etc...

And the event that you are doing large scale performance computing, was Intel a monopoly there?