I've been playing my route where I didn't feed Laurie and Carmen to Callisto, been nice to Sharon, Laurie Lives, and I've got Carmen falling for me.There are more than 2 paths already.
1- Fed Calisto/Treat Sharon poorly-Laurie Dies-Carmen Love
2- Fed Calisto/Treat Sharon well- Laurie Lives-Carmen Hate
3- Not Fed Calisto/Treat Sharon poorly-Laurie Dies-Carmen Love
4- Not Fed Calisto/Treat Sharon well- Laurie Lives-Carmen Hate
All have some implications down the line.
The answer for why they do their updates the way they do is they do this part time and have other "real life" jobs. They have to do this when they can. Also both have other projects they work on as well.
For those who don't do both Laurie paths, there will be a lot of shared scenes in the future so it will not make you "suffer" too much.
Peace
Kinda hoping she ends up my new thrall and/or I turn her by the end of the game. Then we have Laurie with Sharon's bloodline and Carmen with my supervamp bloodline.