Instead of talking about the next development, how about establishing improvements we have seen so far as a baseline.
Actual accuracy in detail, thinking about the vastly superior details on European models.
Cavalex/Accurascale/Revolution etc are getting there, no point in wishing for gizmos until some of the errors and horrors are no longer presented and us expected to pay good money for "toys"
We still don't have accurate brake details on Air Braked wagons.
Coach and wagon tail lamps... Available as standard please.
Cab lights? For the amount of time I actually use mine... Total waste of manufacturing cost, same with opening doors.
Could go on for ever..