The problem with the Alexis path is that whether she's included in the story or not makes no difference. She's completely modular. If you're not on the Alexis path, then any main story scene she would have otherwise been in will go on just fine without her.
It's the same with Cara and Nikki, though at least they serve as a narrative explanation of why MC decided to move back home. Outside of that though, they disappear. That's why I consider all three (Alexis, Cara, Nikki) to be "optional" LIs.
Personally I'm only really interested in Valeria, and maybe a little Layla. So I rarely do any playthroughs involving Alexis/Cara/Nikki. They're just so irrelevant.