Tom,
Can't answer about 3D,etc.,but yes detail is lacking. Airlines that couple magnetically would be a nice addition. These are available in HO for years now.
Grab irons are another thing that doesn't seem readily available as add ons,though over the years I've run across posts mentioning grab irons as add on detail so I guess that's still there.
This is a great scale as far as size,for older eyes,but from a cost perspective as well as availability,O lacks a lot. It's understandable as even HO presents space problems for many modelers,so O&G Scales are more for club layouts in large areas.
All of this is just my opinion for what little it's worth.
Alan Hummel