.... They aren't considering the impact to others.
Maybe they just have a more realistic understanding of how many "others" share your views. I don't claim to know what proportion of the marketplace is ready to be done with the optical drive, but I'm pretty sure it's a larger segment than just Steve Jobs and the eight or nine of us in this thread who are. I think that the percentage of the marketplace still needing internal optical drives is a lot smaller than you do.
It's tough to avoid falling into the trap of false consensus fallacy when it comes to disagreements like this. We all sort of want to believe that our experience and our preference is universal, or at least common. Respectfully, I'd suggest that you take some time to consider that maybe (just maybe) you don't actually speak on behalf of the majority or on behalf of all the Mac-buying "IT departments" and "churches" in the world.
Minimally, I know at least one IT Department that is looking forward to the end of onboard optical drives. Mine.