A good analysis Paul. I agree that the standards for creating content (specifically scenery, locos, trees, etc) has progressed considerably since "the day". I would also add (my theory) that the pressure for this change has come from both ends of the product - the consumers (us) who are always demanding more realism and better quality graphics; and the developer (N3V) who have to keep ahead of the competition. Add to that the obvious point that train simulators are very much a small niche market.
But at least us amateurs can still create and upload routes.
My thoughts.
Very fair point. But to illustrate the problem - I was interested in developing a UK electrified route (there is some very good track and catenary available), but I realised there were no modern loco models* (up to current standards) to run on it, so I've had to shelve it. Ultimately, we have to have train models to make it worth building routes - the egg does come before the chicken!
Paul
[*for me that means classes 81 through to 90.]