Because I don't want anything you have, but trying to build a whole barter chain where we trade everything in sequence until everyone gets something they want is wildly impractical. As described in my first example.
And yes, today I pay a dude money and he does the thing. I don't have to clean his gutters so he'll agree to knit me a sweater.
If you go all the way to the start of this thread, it began with "Money shouldn’t exist. Hope that helps!". So that's what I'm arguing against. Money will be reinvented because it serves a very real purpose.
Also if something happens 1% of the time you still have to account for it.
And "I can do the thing. I don't really enjoy it. For some incentive, I'll do it" is more than 1% of what's happening in life.
Money predates capitalism. The reasons why it was originally invented remain. Once your favors have any complexity at all, someone's going to have the obvious idea of "why don't we abstract this?"
Money does predate Capitalism, correct. Never said it didn't.
Read the text I linked, you're assuming I am referring to an anarchic system of favors and not a system where the government produces and provides pretty much everything via planning.