Part of this is that I live in the dumbest possible timeline.
The only thing propping up and talking about Kamala Harris as a potential candidate in 2028 is the rightwing info/media complex. And they dominate the conversation. There are literally no Democrats in any position anywhere talking her up. She deserves absolutely no deference in 2028. What losing Democrat has ever received any deference per the next election cycle? This is so stupid. It's more about MAGA jerk-offs masturbating than anything else.
Al Gore is probably the only Democratic candidate in my lifetime who had earned any kind of deference per 2004 due to the circumstances of his "loss", and he got no deference at all. I can't remember if he even ever formally said he wasn't going to run?
If Harris runs for Governor of California in 2 years and has a great record and turns into a Barack Obama or Bill Clinton in the next 8-12 years sure maybe she's got a chance in 2036, although I highly highly highly doubt it. She would be too old hopefully by that point. I'm assuming the Dems are going to win in 2028 so 2032 is shut off for her.
Republicans are the only party where losers get 2nd chances (see Nixon, sort of Reagan, and then the cult leader Trump). I guess Adlai Stevenson getting the Dem nomination twice in a row was seen as kind of a weird coincidence, he wasn't really the top candidate pre-convention in either 52 or 56.