I have too many thoughts on the subject for just one visit to the laptop, but here goes my intro:
I can score a film without writing a single note down on paper. Most film composers can, especially entry-level. At the University of Tulsa, my entire "Introduction to Film Scoring" class was completely digital. No actual scoring required. Just create the appropriate music directly in a DAW. Obviously there was much more to the class than this, but no assignments required notation.
This is simultaneously freeing, and enslaving. One the one hand, it's easier for someone to create a decent score for little to no cost, but it does very little for a composer's skills. Using Logic Pro to create epic chase music or a chilling suspense theme doesn't help the composer move towards actually recording with an orchestra.
What I've noticed about the music created by actual composers using these programs:
1. If they actually write the score out and use the midi-controlled export, it sounds fake - because they aren't performing the parts for a realistic sound.
2. If they skip the writing and just record with a keyboard, it's not musical and melodic. <---That one's been me.
The last problem is some great composers don't have the skills to work with these kinds of software. Why should they? They're musical professionals, not computer tech wizards!
Too bad. In my experience, you've got to learn both. If you want to score your first low-budget indy film, you won't have an orchestra to work with. If you want to move up, you need to know how to collaborate with other musicians. If your dream is to be the next big star, learn it all.
-Aaron