What is the most pointless and tedious- yet satisfying- thing you've ever done? - Something totally useless that helped nobody and was kind of a pain in the ass but provided you with some kind of satisfaction and/or joy.

If someone's doing something tedious that helps no one and it's a pain in the ass but they keep doing it anyway and find it satisfying, that sounds a little like some kind of OCD compulsion and they should probably look into that.
 
Like anything artistic related really
^This. Wanting to learn how to draw something new (for example, a crocodile) and doing it over and over until you get it right. Annoying at the time, but once you see how much you've improved since you first started, it's worth it.
 
^This. Wanting to learn how to draw something new (for example, a crocodile) and doing it over and over until you get it right. Annoying at the time, but once you see how much you've improved since you first started, it's worth it.
Calling the development of a practical and quite applicable skill "pointless" really stretches the definition of the word.
 
Mustering the will to start folding the laundry is the most Herculean task known to man.
 
Archiving my 25,000 ebook collection so I can quickly look up what I have by author or title.

….you can probably add autistic to the tedious but satisfying qualifiers.
 
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