I already posted what Kamala's job was and she wasn't a "border czar." Here's a paragraph from that article and a link to it. Take the rest of the day to read and digest it, and then get back to me.
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In fact, Harris was never put in charge of the border or immigration policy. Nor was she involved in overseeing law-enforcement efforts or guiding the federal response to the crisis
. Her mandate was much narrower: to focus on examining and improving the underlying conditions in the Northern Triangle of Central America—El Salvador, Guatemala, and Honduras—which has been racked by decades of poverty, war, chronic violence, and political instability. The strategy relied on allocating billions for economic programs and stimulating private-sector investment in the region in hopes that these programs would ultimately lead fewer migrants to make the dangerous journey north.
These are your words, not the words of all Democrats. Furthermore, we didn't say that she is "vastly more experienced than Joe Biden:" because nobody is. She is the natural choice to continue Biden's policies because that's already her job as VP. Those of us who strongly supported Biden will now support Kamala.