When I say the basics, I am referring more to the private student who constantly wants to hold altitude by looking at the pretty screen, instead of looking where the nose is on the horizon. Funny, we then see IOE captains complaining that new guys can shoot an ILS fine, but can't do a visual approach.
As far as instrument training, I don't feel the glass is a huge hindrance, although the lack of true partial panel practice, and the fact that you don't have to keep as much mental situational awareness with the moving map and hold entries drawn out for you can cause a problem if the student isn't well motivated.
Wow, that was a long sentence...
Fly safe.