I mean, the reason is that those async patches were just sitting in the queue for a year, and by starting Neovim, they could get them in right away.
Then Bram started competing afterwards.
Those patches were broken to begin with when submitted to Vim, and never got fixed until NeoVim was forked out of the blue. People generally don’t know the details of this, and blindly blame Bram.
Why did it take neovim being forked to get those patches fixed?
Is there evidence that the fork was the root cause of that action. and not a mere coincidental correlation?