I’m always curious that kids want to be taught by profs or that colleges will say, 97% of classes are taught by profs.
I had crap profs and great profs.
Similarly I had crap TAs and fantastic TAs - one was in History, a PhD student at Syracuse. I remember his name because he inspired whereas I only remember one profs name (he was outstanding too but unfortunately has passed).
I know it sounds nice on paper and for marketing - Only PhD profs teach our classes but many can also get a great experience from a TA, who given their age, often are better able to connect.
Or perhaps because they are new, they have a passion that not all profs do as they’ve done it for so long that the flame has burned out.
I’m not sure the teaching quality or learning amount is less, etc.