I'd kind-of hoped that when they moved the BBTF movies to BD they'd go through the second one and update the special effects.
The two Bobs say on one of the dvd commentaries that they don't believe in doing that, which is an unimpeachable position.
Which is fine and all, I respect that.
Ok, by saying 'but' at all
it's clear that you don't respect their opinion.
They don't reject it because they think it'll be overdone. They reject it because they think any change in and of itself is sacrilegious. Forget CGI...they would similarly reject the idea of a special "director's cut" edition. They think a kid in 2015 should have the chance to see the same film that a kid in 1985 had.
So to say "I respect the fact that they want no changes but here are the changes they could do
" just shows that, no, you don't actually respect their opinion.