If you went down that route, wouldn’t you include “enjoyment” as a goal, as a way your life would be “better”, and so that would get taken into account in your analysis?
Usually most people set goals that require some level of effort and/or self discipline over a longer period of time. I suppose you don't have to do this, but this is usually the standard reason for setting goals - so you can accomplish something you otherwise wouldn't if you didn't give it some special attention. Most people do things they enjoy by default - you only need to make some time for it, you don't really need to set a goal to do it.
Yeah, so this is kind of my point, actually. I like my hobbies, so they don't really require much effort and self discipline to engage in daily. If I don't have time to study one day, I don't beat myself up over it. It is just sort of my default thing to do when I have free time.
As another example, I also read fiction. I don't set goals like "I want to read X number of chapters this week" or "I want to read for X hours this week", nor do I track how much time I spend on it. It is purely for enjoyment, it doesn't matter.