The crazy thing is that if Biden ran in 2016, we likely would've never had Trump as President and things would be much different now because Biden was more likable coming off the heels of being Obama's VP for 8 years, would've been a domino effect.
Dems made the mistake of having women run against Trump, twice. It is still mind-boggling as to why they choose to since it's clear America isn't ready for a female president, at least not now. I know a lot of people don't wanna believe it because now you're dealing with what-ifs, which in hindsight makes losing this election even worse, but there's a possibility Biden probably could've repeated had he stayed in the race because he still had things in favor when it comes to the biases of voters.
I still don't think it was a done deal but Dems panicked and ultimately made a choice that might've set the country back. Kamala never had a chance in this political climate due to too many things going against her, the smear campaign was at an all-time high.