Its like... Fluff and a record sheet in a book don't really make me interested in playing an unique 'Mech. Either one can be interesting but that's all.
At worst, i don't know what the pilot is like. How do they act? What's the proper way to play them? Alternatively, they're important canon characters and they will feel too restricting, or just plain weird depending what kind of game i'm playing.
The pilot cards we got previews for, they have a 'Mech, skills, SPAs, faction, some background. But they aren't existing canon characters (at least none i recognize), and they aren't seemingly tied to any time or place. Hence, "generic-uniques".
(These have generic 'Mechs but this was just an example.)
If these pilot card pilots had unique rides, i reckon i might try them out, at least more likely than i'm anything else.
No, this ain't that different from book having fluff for pilot and their 'Mech's record sheet. But it feels different.