I do find it funny that the eldar companion in RT is exceptionally autistic even relative to her race. Eldar interact with humans all the time across the galaxy, corsairs work with humans constantly, the Indomitus Crusade was founded with eldar present, and there are even a few half-eldar in various books and rpg supplements (whether they are currently canon or not). Yrliet's own people don't even like her, she can't convince the survivors to even listen to her and she was the designated monkey tamer on Janus that the farseers knew might die like the previous one did.

Thousands of people are getting their first impression of what eldar are like from Yrliet, which is just really unfortunate lol.