Even if 100% of those people are using a Mac (and they aren't... I help teach CS at a University in California and 75% of the people in my intro class this year have a Windows laptop: I counted, as I was that shocked at how different this is than five years ago when everyone had a Mac), you first have to show that there are actually a lot of those people, and there simply aren't... "engineers at tier-1 tech companies" plus students in "any engineering class at a university" is a tiny tiny tiny percentage of the market Apple is optimizing for.