I think the difference today is more than adoption of "electric manuscript and pencil" technology.
I'll go so far as to say this: the sine qua non for any would-be composer of orchestral music is to possess very well stocked auditory experience of orchestras playing live.
The clock cannot be turned back now. My dream is for electric manuscript and pencil technology to include Orchestral Intonation. I firmly believe that will, in its own good time, dramatically increase the chances of an abundance of great works of composition.
Even on the popular music side, what was the impact of the disappearance of orchestral instrument combos in the post-war decades of the 20th century? I believe musical sophistication and art took a terrible turn for the worse in western popular music following that disappearance. And I speak as one who doted on his LP collection of popular works back in the day - from Santana to Hendrix, Zeppelin and Floyd and so many others.
Yes I agree about the need for auditory experience. And this is is a fundamental training requirement in classical conservatories, and is honed to an exceptionally precise level in JW/Mahler/ etc., ..and surely some composers on this forum too. Thats what fascinates me, the ability to do that as a craft.
Btw, you are putting a lot of emphasis on orchestral music. But what I am referring is more about the craft of "inner hearing". With this, one could write a jazz piece, rock piece, with a solo instrument, a quartet or 100 instruments, be it electronic or acoustic, or even virtual samples like VSL!. After all, a huge repertoire of western classical music is for small ensembles.
In my thinking, the question is not about the tools used, but rather, what level of musical (tonal/harmonic/textural/rhythmic) imagination is done by the brain vs left to the computer. The craft needed for "brain" composing (including solfege, inner hearing, etc.,) is the same irrespective of the tools or the style of music , and is dying. As historical evidence points to, the more work done by the brian, the more complex and rich the music is. This might hold true, until maybe if and when we get true AI, probably in a 1000 years.
Cheers
Anand