I think the biggest flaw with Bernie is he turns into a cheerleader for the democratic nominee after he loses the primaries. He did it for Hillary and he does it with Biden. I understand he is doing it because he thinks trump would be worse, but at the same time it kinda hurts the progressive movement and messaging. It feels like we are giving up our progressive goals just to elect Biden, or else suffer an even worse option. It kills the enthusiasm when both the options suck and it feels inevitable that the one we actually want will lose or has lost already.
Don’t get me wrong tho I love Bernie, but this is my biggest gripe with him.