Not saying you're wrong (and I'm asking these questions for my own education and as a Devil's advocate), but the build-up shows a decent metallic finish and the other details still seem crisp (especially with a wash added). If the texture created a compromise in some way, it doesn't seem to be a very big one. If he used a filler primer, it didn't affect the crispness of the detail and if he didn't use filler primer the finish turned out pretty good regardless of the texture. In either case, it doesn't seem like texture is an issue. Why would I need the plastic butter smooth if the finish will turn out nicely metallic and I'm going to be weathering the hell out of it anyway? Nobody intends to keep the model bare plastic, right? So, as mentioned above, wouldn't the texture serve to help the primer and paint stick better to the model? If the paint sticks better, and it doesn't significantly affect the quality of the finish, then is it even an issue?