Questions about characters that were on the OG series but not Gen Q

Okay, so I understand Jenny and Dana not being used in the reboot bc they passed away on the original series. But I have questions as to why they didn’t bring back several other actresses from the main show. I get that people move, break-up, and grow apart after 10 or so years but it still felt like a lost opportunity. Also I should note: I only saw the first season so apologies if I’m wrong about a few of these!

Kit- I get that she was killed off between series and her death makes some sense given the opioid crisis and her past struggles with alcoholism and I’m assuming other drugs. But was Pam Grier not available or interested in doing the project? There’s already been a few main character deaths…did they really have to do another?

Helena- Where was Rachel Shelley?!?! 😭 Anyone know why she wasn’t involved in Gen Q? For me she had such a fun arc nearly the whole series and her absence felt glaring.

Tasha- I loved Tasha and love Rose Rollins. It’s fine that Alice and her didn’t last but couldn’t they at least have done an exes lunch or been friends? Why wasn’t she involved?

There’s others I could list but those are the main ones I’m curious about. Any tea as to why they weren’t involved in the reboot? Much appreciated!