You're absolutely right. Most of these self-proclaimed leftists don't even pretend to have any clue how to start a revolution, whilst demanding it as the only possible course of action.
There absolutely are folks precisely what the OP is talking about. One verbatim quote from an exchange I had:
"Revolution is necessary, electoralism cannot work."
He was absolutely adamant that voting is stupid and people shouldn't bother because we need "true communism" that cannot come from voting.
People were saying the same about Biden and look at all the stuff he did. Green energy, ira, drug price controls, chips act, etc. So yes voting Dems will give you a better system.