Sadly, Beags, times they are a changin'.
Even CFS(Tutor) Sqn are now converting over to a Powerpoint-based briefing system, written so as to still extol the virtues of good instruction (Pose-Pause-Ridicule, et al). Although, it was hastened to make use of the influx of IT into the setup.
My view - good instruction is just that, no matter what the medium, and so long as whatever VAs you have available are used to their optimum (note, NOT maximum!) then the stude should feel that he/she knows what's going on.