Too experienced????????? No that translates as too old. Not just the airline industry indulges in this 'bellex'.
It's the same reason you can't get anyone in a shop or a business these days that either cares about their job or even knows what they are doing. Take someone straight out of school and treat them like they're still in school seems to be standard management practice these days. Us oldies won't take the crap but the kids know no better.
It's a sad state of affairs.