You're a bit out of touch there PN - that changed a great deal 10-15 years ago.
I would second that. The RAF is vastly different compared to how it was, mostly due to increased workload and fewer personnel. Being involved in almost constant Ops helps to broaden the mind and also helps to raise experience levels compared to service in previous decades.
One only has to look at the number of FS who regularly stand in for Sqn Ldrs at short notice without batting an eyelid.
One also has to look at the number of NCA who, although sailing through OASC, are unsuccessful or unsuitable for pilot. Most have been or were offered Commissions in another branch. Almost all refuse and opt for NCA.
Of those who later re-apply for a Commission, I am yet to meet one who is unsuccessful.
I did hear a story of one particular ex-NCA Officer Candidate who was backsquadded due to having too many SNCO qualities. Said person's ex colleagues remarked that it was a shame that the individual chose ITC to display previously unseen qualities!