I agree the terrains as-is are 'good enough'.
Obviously nobody will ever say better graphics are bad, assuming everybody's computer is up to the task. Unfortunately most of our PC's do not run on magic, and artwork to take advantage of new capabilities also does not appear by magic either.
For a really good idea of the number of people you'd be cutting out, take a look at the channels in FSO events that have been cloud heavy. A sizeable number of peoples' PC's can't handle something as simple as clouds.
Now, the ever-increasing ground game means people spending a ton of time staring at the terrain features for one reason or another. I totally agree that for that, 'good enough' from the air is not good enough from the ground.
I don't envy HTC's position with the graphics as they are, and the customer base they have. Split between guys with more computer than God, and guys who bought their midrange systems in 2003.
Wiley.