I don't agree.
She will probably win and realistically a divided convention could have been a massive disaster. More like probably would have.
Instead, democrats unified and Harris hit the ground running surprising everyone, including most democrats.
Biden set the table for this.
He shouldn't have run at all in the first place, but he did, and he also finally did the right thing by exiting just in time to give the democrats a fighting chance against the maga fascists.