Ah, an excellent thread.
I have lived on EU for about ten years now. So, you should know where I stand.
IMO, TPM was one of the worst movies ever made and I have very little respect for the prequels and prequel era material right now. As far as I'm concerned the prequels are the alternate universe, where as the EU is the real one.
Because all the EU novels were nearly all set after the trilogy, which he didn't care about. His off-limits zones were all in the past, in case people tried backstories.
He cleared prequel work on Han and Lando- and made the mistake of letting Fett through as well.
But the canon policy was clear from the very start.