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.

[Fruttasecca]

Fapping

 

[Ogre Magi]

Argue with others here endlessly about politics.

Your answer really should be participating in your own dumpster fire of a thread, Felix.

 

[s0mbra]

Cross stitching is the definition of "tedious but satisfying"

 

[Executive Petrel]

Everything is cope, even coping.