Thats because we are primadonnas, the lot of us.
The rest is merely detail
Exactly the opposite is true, IF you aim to be a good exec pilot. At least in my opinion. (and surely depending on the organisation behind you)
I "operate" a citation mainly in EUR,EEU and MES without any backoffice. (I do flight/fuelplanning myself and arrange permissions, keep the maintenance on track and organize our simulator trainings, deal with suppliers, sort out subcharters if required etcetc.) An Airliner with pure airline knowledge would have a painful learning phase doing that. There is no reason they cant learn it though, but you need a different mindset to achieve the results wanted.
But you KNOW that already, dontcha?