I'm... torn. I think that we need idealists to lead because they can inspire. But pragmatists get more done. I voted for Sanders in the 2016 primaries, and again in 2020, because I believe in his message. But I also voted for Biden in 2020 even though the Democratic party fucked Sanders. (I voted for Stein in 2016, because I was in a reliably blue state, and could vote for her without risking affecting anything. And man, do I regret that.)

Note that both of these behaviors may be valid strategies, rather than ideological fervor. As members of the Democratic Party, Harris and Warren are somewhat expected to participate in team efforts; while Sanders, by virtue of being independent, should avoid being taken from granted, as forcing other representatives to negotiate with him gives him a bit of leverage to introduce changes to bills. There's a reason why he's been capable of influencing so much policy despite being an outsider.