a wealth tax

Did she actually campaign on this, or was it just some white paper she had on her website? There's a difference between having a policy that you are campaigning on and actually intend to carry out and some vague policy paper a staffer wrote.

25k credit for first time home buyers This was an absolute embarrassment of a policy. Did you see the requirements on it? They presented it as a typical neoliberal bullshit policy. It was filled with so many specific requirements that almost no one would qualify for it. And it was bad economic policy too, as it would simply serve to further inflate the overheated housing bubble.

support for legalized cannabis

You cannot run on something that is one of your severe policy failures. Democrats have been running on the cannabis issue for multiple cycles at this point. They've all dragged their feet and slow-walked it for cheap political points.

support for trans people

She's objectively better on this than Trump, but trying to Third Way it, she screwed herself over. Democrats were vocally supportive of trans rights before any kind of major backlash emerged, but their support was only ever skin-deep. Trans issues were largely absent from the recent DNC.

The Republicans latched onto anti-trans bigotry as one of their major campaign planks, and the Democrats responded by just trying to ignore trans people entirely. They avoided discussing trans people whenever possible, and they never came up with effective responses to Republicans' main attack points. If you actually believe in trans rights, the correct response to the charge of "you want men in women sports!" is to say, "well trans women aren't men, and you shouldn't moronically assume trans women have the same athletic advantages as cis men." If you actually believe in trans rights and equality, you would say, "the differences between men and women sports performance is almost entirely due to testosterone. Any minor differences that remain are not worth discriminating against people over." Etc. You know, actually RESPONDING TO and REBUTTING the attacks Republicans make against trans people.

Centrist democrats showed conclusively that their support for trans people was nothing more than shallow political pandering. The Biden administration hasn't been using all the levers of federal power to protect trans kids from their state governments.

This kind of mealy-mouthed centrism is what cost Kamala the election. She isn't an enemy of trans people, but she's also not a real ally. She doesn't want to actively harm trans people, but she doesn't have some fundamental belief in the worth of trans rights. It's just another political football to her. It was beneficial to seem extremely pro-trans in 2020, and now that the conservatives have rallied against trans people, now she's not so eager to defend trans people. It seems disingenuous and it made her look like someone who would say anything just to win the election.

How many of those 10-15 million watching from the sidelines would have shown up for a pro-Palestine candidate?

No one was expecting her to become a rabidly pro-Palestinian protester. No one expected her to get up at the podium and say, "actually, Hamas did nothing wrong, and the Israelis should be relocated out of Palestine." People wanted her to make US military aid contingent on Israel meeting human rights guidelines. Israel, despite all the precision weaponry we give them, has a worse civilian:military kill ratio than Hamas. They kill more civilians for every soldier they kill than radical terrorists. Despite all their high-tech weaponry, THAT is how unconcerned Israel has been about civilian casualties. Hamas has done a better job of avoiding civilian casualties than Israel.

Anyway, the polling showed that calling for a cease-fire and other measures would have been immensely popular. This was a completely unforced error on her part. She threw away votes for nothing.