Yesterday I attended a psychology seminar where the presenter commented that the RAF has a policy of not allowing pilots to use multi-screen displays below a certain age (24?). Apparently, using multiple-displays below this age may actually hinder the development of the ability to multi-task. As a consequence, the RAF restricts the use of such displays in it's younger (trainee?) pilots.
If the RAF has a policy on this I've not been party to it despite working as an OCU instructor on a glass cockpit ac for most of the past decade. Then again by the time most of our 'young' pilots have completed their training interspersed with numerous lengthy holds they're pushing 30......