A big part of the Democrats’ problem is having attitudes like this, whereas no Republican would dream of suggesting that any particular voter could not be converted to movement conservatism. (Which is why you get frequent inanities like the assumption that Larry Elder’s campaign could win California; Republicans have never written off that state, or any other one.)
The problem with triaging is that eventually you’ve triaged >50% of the electorate.
Bingo. I don't get the mindset of Democratic partisans, honestly. They seem to be very content with the fact that younger generations are inelastic Democrats so far, women are zooming left, and non-white populations are growing, all positive trends for the Democratic Party. And yet, they're so willing to give up on winning actual races.