It's nowt to do with LCC or full service or even the airline industry, it's how modern customer services/call centres work - lowest common denominator, just follow the script and if the person writing the script hasn't thought of it, well tough.
The answer might have been obvious to you, from your end of the telescope, but not to somebody trying to work out all the implications of the change. Quite possible they aren't even Flybe employee's.