The 5 computer limit (which I always end up hitting) and having to "Authorize This Computer" is one of the most annoying aspects of iTunes on the Mac for those of us with multiple Macs. It always seemed clunky and dated the way that was set up, and to make matters worse the "Deauthorize All" option only works once a year, meaning I was forced to contact Apple Support just to exercise that option twice in a one year period. I was sure this limitation would finally be gone once iTunes was split up into multiple apps, but it appears to have carried over to the Music and TV apps on Catalina as well. Why is this 5 Mac limit and having to "Authorize This Computer" or "Deauthorize This Computer" still a thing on Mac when the Music app on iOS devices has been free of this limitation for years? It's as if Apple deliberately wants to frustrate Mac owners, but I can't think of any rational reason for doing so.