It's paradoxical to pay to remove features. It is even more paradoxal that AP often uses oversized textures in their own trains... So to make them run, they have to reduce other stuff.
PS : I'am nearly sure they do exactly what I did for AS Koblenz Trier light weight texture pack : delete too big NM texture and rename the NMC to NM (or make a copy of the NMC into NM). DTG always uses about the sames assets, so reducing the assets from one route mostly works for some other ones. Not a bad idea but it should be a free patch.