[Question] Things can be difficult in 3 ways: Painful, time-consuming, or uncontrollable. Is this reasonable to say?

I have noticed that when someone says that something is hard or difficult, this can mean several different things. I think I have broken it down to 3 categories:

  1. A thing can be difficult because it is painful—it involves pushing through experiences that you would rather not. For example, eating healthy can be difficult because it is unpleasant in the short run compared to eating whatever tastes best.

  2. A thing can be difficult because it is time-consuming. For example, learning a new language is difficult because it can take hundreds or thousands of hours, even if the work is largely neutral-to-interesting.

  3. A thing can be difficult because it is uncontrollable. It depends on factors outside your control, such as the actions of other people or pure randomness. For example, getting a new romantic partner can be difficult because you need to find someone who wants your or convince someone to be with you. Getting a royal straight flush in poker is also difficult because it depends on the luck of the draw. (I think; I don’t know poker.)

Of course some things are difficult because of a combination of two or all of the above. Becoming president of the USA takes both lots of time, hard work, unsavory compromises, and the cooperation of many other people, plus you need to satisfy some requirements outside your control such as having been born in the USA.

Do you agree with the above categorization? Or have I left something out?

Thanks in advance!