bg questions

I have been playing both BG:EE and the BGII:EE and had some questions with regards to them.

In BG:EE I noticed a much nicer looking interface, and several new and imo better voice sets. And it may be my imagination but the sound and music seems separated into channels which feels more engaging to me. However in BG2 I never noticed any of this. No new interface, no new voice sets carrying over and the sound doesn't seem as dynamic.

I know a lot of the original art work was lost and I know about the court battles with Bioware, was it? I don't know much of the details and what they were trying to prevent. It's a shame BeamDog didn't secure the rights to Icewind Dale at the same time, though the story was not as deep the game had some nicer spell effects and other things that would have benefited the BG series to be even greater. But the game, other than widescreen and some new characters doesn't seem much different to me. In the original I never encountered any bugs or glitches so I notice nothing different there. Anyone know why some of these things never carried over?

Thanks