A quote from RS that I recalled from talkbass.com concerning this very issue:
"I have two main issues with 35" scale. First, it is not a magic fix to create a tight B string. I have seen many 35" basses with B strings floppier than ours at 34".
The other issue is tone. When I did prototype 35's many years ago, I felt the bass became more "generic" sounding and lost a lot of the tonal character I am used to hear in my basses. Finally, I especially disliked the sound of the G string in the upper register. At 35", it starts to get nasal sounding to me . . . "
-- Roger Sadowsky
I couldn't have said it better myself!