A number of years ago I was in Germany for work and when my business there was completed I had the luck / opportunity to stop in at a local car show / picnic. There were a few Mercedes Benz 300SLs present, gullwing and cab variants. One of the gullwings was actually a bit dirty - in nice condition, but clearly driven -- dirty wheels, bugs and tar on the nose, some road rash in the front and along the lower quarters. I was talking a little of my broken German with an older German gentleman -- his English was better -- and I commented that I liked seeing the 300SL that looked driven. He agreed, told me he was an employee of Mercedes Benz when those cars were built, and that yes, they were meant to be driven. I lack the means to own and daily drive a 300SL but if that were to change, I would drive one. And probably track it at vintage events too.
I respect different views of how to approach any hobby. But my personal view is that this gentleman's advice is applicable to the train hobby as well -- they were meant to be used and enjoyed, so run 'em all. You only go around once. No practice tries.