You're slightly overestimating identity politics and underestimating how much people are just glad they have someone besides Trump or Biden to vote for.
The main reason Dems are excited isn't because of Kamala being female/black/Indian, it's because unlike Biden they think she actually might be able to win.
The main reason Dems are excited is because the phrase "Republicans fall in line, Dems fall in love" is true. Dem voters have to be coddled, massaged and taken out to a spa like feminine hoes in order to be motivated to vote. They also like stars the same way normal people like Hollywood celebrities. Biden is and was not a star. Obama and Bill Clinton were stars that had an aura. Hillary Clinton was also a star, but that image was ruined partly due to her own doing.
Kamala is the perfect person they could fall in love with. She checks all the identity politics boxes that liberals get excited about and she's considered a star in the party.
To me, this is nothing. Just because Democrats are happy right now and there appears to be some kind of special feeling, that does not mean she's going to win. I would be very careful falling for this trap of over interpreting 'the feeling'.