I am glad as well that Biden didn't choose early re VP. I would like Warren on the ticket, more for feels rather than strategy - she was my first choice, and I think that whomever Biden chooses as VP will be running for the top job in 2024/2028. Harris would be a bad choice, although she is a great pick for AG/Cabinet.
Abrams would indeed put Georgia into play for Biden, if not for an outside chance of winning, just making the GOP spend time and money to defend EC votes they considered "theirs" and therefore safe. PLUS, Abrams, as @
Skroe pointed out, would electrify the south, making FL and maybe even TX scary places for the GOP, where they could lose (FL) and would have (again) spend time and resources to defend to keep (TX).
Plus, while Warren would indeed destroy Pence in any verbal competition, Abrams is pretty fucking bright herself. She will wipe the floor with Pence, if he bothers to show up and sit (alone) at a table with a woman other than his wife.