I would add another thing to this I wish the author would talk about instead of immediately projecting onto their own prejudices: People generally prefer the “good” option in games.

And I don’t even necessarily mean whatever the game calls Paragon-vs-Renegade. I mean the fact that for a game where you recruit characters to your “camp”, naturally losing characters feels like a fail state. Like you messed something up. As a result, players will intuitively lean to options that present the least “bad outcome”, in this context meaning the less often NPCs leave your camp the better. Recruiting someone is a victory, someone leaving is a defeat. The games present it as such, so it’s no wonder players err towards wanting everyone there.