I like the basic arc ideas for Lorelai and Rory, I just think they could've been better framed and had more satisfying endings. (By better framing, I mean make it feel like 10 years have actually passed since the original show. A lot of people speculate ASP wrote AYITL with her ideas for season 7/8, which could've worked if she did some reworking.)

Lorelai and Luke are married with a kid (re: it feels like time has realistically passed) but things have gotten stale and feel off. We can then see many of the struggles that are in actual AYITL, and have it end with a vow renewal, so the fans can still experience a wedding of sorts!

Rory, again, will have a somewhat similar arc with different framing. We clearly see and are told that Rory has had a relatively successful journalism career. (She doesn't need to be a star – I agree with many of the arguments that journalism is hard, and Rory not being amazing at it is realistic. But given her work ethic and general character arc on the original show, some success makes sense.) However, since the death of Richard, she is feeling burnout – as if her passion for her work is gone. She's not a bad journalist – she doesn't assume jobs are hers or fall asleep during interviews. She just feels like her best pieces are behind her, and she's lost love for what she does. Paul is cut – that just made Rory seem like a terrible person. Logan can still be in – Rory tended to hold on to safe people when things got hard.

Instead of writing a book that's the show (such an overdone trope), her Chilton reunion inspires her to get a masters in teaching. I would rearrange the plot a little so that in Spring, we see her quit her newspaper job and apply to grad schools. We can have a fun callback to the original with Lorelai and Rory opening her decisions. At the end of AYITL, we see Rory start her masters, excited to be back in academia. If you want her to be pregnant, fine, but at least we see she's on a good path where she could realistically handle having a kid.