I would restate that as people not pushing through past their initial uncomfortable feelings and preferences. Similarly, of all the people who have ever tried P

I would restate that as people not pushing through past their initial uncomfortable feelings and preferences. Similarly, of all the people who have ever tried Prolog only a small fraction got past the "this is weird" stage. Or Forth. This unwillingness to learn something more than slightly different is limiting, and usually expresses itself in other ways as well. That does NOT mean that such people aren't good developers. You do run risks asking them to work outside their comfort zone, though.