There's often an unwillingness to make the financial commitment to a good instrument when "I don't know if I'll stick with it" (or much worse, parents saying that about the child getting their first guitar!). So you're supposed to learn on a "beginner guitar" (i.e. a shitty guitar). It's so much easier to learn on a good instrument.

And good instruments don't have to cost a fortune, either. If someone wanted to learn electric, I'd say just buy a new Squier (by Fender). They're crazy good guitars. And at the $500 or so mark, modern Chinese-made acoustics start getting really, really good.