i'd be prepared to bet that a lot of people are turned off by the current GUI (see separate discussion about younger people not using the program)....
I started with, IIRC, the 2012 edition with the slightly older interface still, of a notepad with a 11" diagonal screen, and I found it both very clumsy and on that notepad unusable. At that time I gave it up and walked away. I tried again when the slightly newer interface came out and stuck with it. I'm now running 2023 of that very same notepad, reasonably successfully.
But the interface, whilst better, is still pretty clumsy and arcane.
I still struggle to understand why there's a "Track Settings and Actions" dialog, and on the menu, also a "Track Settings" sub-menu and a "Track Actions" sub-menu. That seems perverse.