IMO, when used is real life scenarios actual users would start to find the unique patterns and visuals in each one. It is hard to evaluate this as a passive viewer with no vested interest in any of the names/avatars as they are presented.

Personally, I saw enough general distinctive qualities among them that I felt like if I interacted with a handful of these avatars frequently that I would notice the minor differences easily.

I'd say unique enough to differentiate people within a conversation, which is good enough for a lot of use-cases