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I have some questions ...

Are you suggesting that self-upvoting full size posts is ok?

Why is it even possible to self-upvote at all if it's widely unaccepted?

Is there any function or accepted use for self-upvotes in any circumstance?

Is it "OK" or not - still arguable. I don't think selfvotes should be TABU in all 100% of cases. I can justify them in some degree, especially if this is used to raise visibility. But 2-5 word comments are a totally different story.
/1

I'm completely with you concerning low effort ultra short stuff 👍🏽

How does a self-upvote raises visibility?

/2
If one put BIG effort, maybe 4-5 hours or more in creating long pots which brings value to the readers - why not let him honor this job with his own UV like all the others can.
"If you don't value your own job - why others should do?"

Boiling it down to a rule of thumb:

NO for low effort posts/threads and YES for high effort posts/threads

?