As to why Kim Cattrall isn't in this anymore, it appearse that the cause of that is that, throughout her tenure on the show, she was NEVER allowed to forget that SATC was mainly about Carrie and that Sarah Jessica Parker mattered more than everyone and everything else in the SATC cosmos- and it looks as though the "no-nudity" clause that SJP had in her contract- which was a legitimate thing for SJP to insist on, but which none of the other cast members were ever allowed to have- was as much about SJP and the rest of the power structure at the show not letting any of the others in the cast forget "their place" as it was about Ms. Parker's right to personal modesty.