Precisely.
I'm not sure what this baseless fetish with 'centrists' is about, since a Washington centrist indeed doesn't nearly align with independents contrary to a common misconception around DP, and centrism was not enough to save Clinton from ruin; if anything it may have worked against her.
Again, it's telling that the most popular politico today is Bernie Sanders; equally as telling is that his primary platform/policy ideas still have overwhelming support.
As to the primary nominations, I largely agree with you, though I could consider support for Warren despite her seeming to prioritize her party over her policy.
Kamala Harris has tried to masquerade herself in order to appeal to the resurgent progressive/FDR wing but I don't think she'll get far with us, much as I applaud her commitment to singlepayer/Medicare for All; too much baggage, too many red flags:
https://jacobinmag.com/2017/08/kamala-harris-trump-obama-california-attorney-general
https://www.pastemagazine.com/artic...harris-the-establishment-has-its-champio.html
Klobuchar I don't trust: very much beholden to her top donor industries; to start, her OpenSecrets page is jarring so far as the sourcing of her war chest is concerned. Then you've got stuff like her lobbying on behalf of the Schwan Company to ridiculously classify pizza sauce as a 'serving of vegetables', repealing the medical device tax at the behest of Medtronic, one of her biggest donors, an establishment position on Medicare for All, and so on; I simply don't think she has what it takes to defy her sponsors for the greater good of the country. I will note that, as brighter spots go, she did oppose the TPP, and has a very positive rating from the United Food and Commercial Workers International Union.