My only real criticism of Warren is that she only seems to pop up as some kind of "activist" during election season. After that, she fucks off and basically toes the partyline. It comes off as very "performative", very "controlled".
And she never has a real chance at the presidency, so the most she can do is basically "shame" other candidates. That shit she pulled with Bernie in 2018, trying to shade him as a chauvinist, lying that he said "a woman can't be the president", unbelievable.
But perhaps the worst thing she does is create division AFTER primaries. Before primaries, it's a freeforall, and you absolutely SHOULD be critical of all opponents, party or otherwise. Do your best to cut out the corpos, the fakers, the shitheads... but after the candidate is picked, and the only opponent is the fascist in the GOP, then the time for discussion is over. You need to stfu, unite and face the real enemy. But Warren couldn't do that..... and she continued to sow division and doubt all the way to the general election, playing a crucial part in democrats not turning out to vote and letting Trump win.
Okay, so I have a lot of criticism of Warren. On paper, her polices are very sound and very progressive. But as a person, as a party member, she's a liability. And so many "Warren voters" followed her with their "protest votes" during the election (not counting the ones who just didn't bother showing up). And she never apologized for that.
So, I mean... cool, good for her that she's endorsing Platner now. Her policies are progressive, but she and her supporters are kinda shitheads.