There could be a lot to say but I'll keep it brief.
I think the biggest insult is that SATC gave such joy, humour and fun placing women in their 30s (well, white women!) front and centre. At the time, many shows did not do this at all.
But now, in their 50s, which a lot of fans would also be, it gave nothing. It made 50+ look boring, vacuous and utterly meaningless. Even with all that glorious NY wealth, 'wisdom' and life experience they could not find any sense of purpose and kinda just gave up.
Thanks writers, for taking away what you originally created by cancelling yourselves.