That's true but it's all about the individual. While there are definetly people who have other things scheduled like tennis lessons and it wouldn't be much different then that. I'm not one of those people. I never have any appointments for anything unless I know I need to, but not for hobbies. I don't play any other mmos. This is the one I stuck with since 1.0.
The difference here is that you mentioned doing those scheduled things with friends. I can't make a static with friends and I don't want to make one with random people.
It's not hard to find a static but it is if I want to play with people I know. I want to make friends with new people just by meeting them, not because I'm forced to like a group because their static schedule matches my free time.
The whole thing just feels like a chore. You must interact with people you don't know, you must make friends with them or tolerate them just to get the raid done, you must be good or you'll make them mad and might get kicked, and often times you must have a mic.
None of that seems fun to me. Again there's nothing wrong with that. I'm sure it's all just efficiency for those that do it, but it doesn't work for me