So IMNSHO:
Miranda would have her own boutique law firm.
She’d have either ditched Steve or sorted out their sex life - this is the woman with a vibrator in her nightstand who refused to take any sermonising from her cleaner, Magda. She would not be an alcoholic although entirely possibly might sleep with women.
Carrie would have her own podcast asking the questions 50 something women want answers to: how to cope with teens, HRT etc. Big wouldn’t be dead and they’d be showing us a happily married couple with no kids.
Charlotte’s kids would be FINE, not questioning their gender FFS
Steve wouldn’t be deaf and Harry wouldn’t be grateful to be able to pee.
There wouldn’t be the Che character
It would be funny. They would be enjoying their lives as rich professional 50 something women.
Samantha would be in it