It seems to me that score-reading would be
simplified to a very great degree if all parts were written at actual pitch and
in the appropriate clef - and I have seen this done in some 20th-century scores.
I find exactly the opposite. When I have been forced to use scores in concert pitch I find it very difficult to hear the sounds and find myself having to do a "back transposition".
In a "normal" score, I can see the position of the transposing instruments on the stave and have a good idea of what the sound will be like. Paradoxically, this also applies when the brass are in their classical transpositions. I can't explain that, I suppose it's just what I'm used to.
All the best,
Lawrence
Of sourse, I am a horn player and used to transposing anyway.
http://lawrenceyates.co.uk
