Basically, what it comes down to is: In my heart of hearts, I just don't believe that a revolution will happen in my lifetime, even if I live to be an old-ass man.
So if I were to just go all-in on hoping for revolution as opposed to anything electoralism-related, in my brain, I'd pretty much be admitting to myself that I personally won't live to see anything get really significantly better, that when I die everything's still gonna suck or be even worse than when I was born.
And I guess I just can't bear to admit that to myself.
The capitalist apparatus will stay dominant for the next generation or two unless there's a collapse that sends us back to the early industrial age.
If you want a taste of communism, you can experience it if you involve yourself in setting up a piece of the world to come- something with communal organization that actively diminishes the power and reach of capital locally and/or globally.
I don't place my faith in electoralism, nor in the ability of a global proletariat to act as "a class for itself". My horizon is a model commune that can draw people away from living under capitalist states and markets, and provide the kind of life for those in it that reflects progressive values.