JJ, happy to accept a smacked bottom on that matter, I was only made privy to that Talon information, by coincidence, about ten minutes before reading your post. All of my numerous previous enquiries to the horses mouth were answered with the CAA being the reason for the lengthy delay.
If it ain't broke, don't fix it......but my guess on the reason for the change to shaft drive T/R was to overcome the negative vibe over the "rubber band" T/R drive system ....whereas the cog belt imho is a great idea, easier inspections, lighter..and no oil bath leaks
Of course, I understand the need for regulation, however, I'm sure we're all aware of a lot of helicopter crashes of late...of properly regulated, certified machines....sadly no machine and no amount of perhaps sometimes 'belt and braces' safety edicts will ever be perfect
Safe flying all....