I'm not certain what kind of demographics you chose to survey, what kind of composers they may be. Although certainly, every person probably has a particular way and workflow to compose, in my experience and knowledge it is very common to find film and game composers compose at the computer, in one way or another. Lots use Cubase, DP, Nuendo, or Logic, amongst others.
I could be part of your surveyed population, as I don't compose on the DAW. Why? Simple- 'cause Sonar SV is totally non-conducive to doing so. I do rely mostly on a Notation program to initiate the process. Sometimes I start at the piano and move on to the electronic staff.
I'm 100% PC, so very rarely check anything Apple-related, but I just had a good laugh at this, please compare the two very similar advertisement strategies,
especially the set of icons, and tell me what you think SONAR maybe missing:
http://cakewalk.com/SONAR-X2/ http://www.apple.com/logicpro/top-features/ I actually found it hilarious. Call me crazy. To me, it is totally obvious. And I do agree with you in that the decision is probably 100% marketing-driven, thus SV will never be up to others. Sadly.
edited for: various typos