- Moving requires money; the further one moves, the more money one needs. If one does not have the money, either in the form of savings, credit, or being able to borrow the money from someone (or by taking out a loan), "simply moving" is not viable. Because it was possible for one particular person does not mean everyone has the same level of financial comfort. This professor chose not to recognize her own privilege.
- If one is married or otherwise partnered, one generally (I hope) takes into consideration the needs of the spouse/partner/whatever-term-you-want-to-use-that's-applicable-to-your-situation. Some might find it easy to get a job; others would not. If you have kids, you take them into consideration...up to a point. If you have kids with special needs, I hope one would take into consideration what support, medical, etc., services are required for your kid, and compare them to what's available. If one's parent(s) needs care, financial, medical, or otherwise, that's something else to consider. Who will care for them? Can you afford (and/or want to) put them into a long-term care facility where they currently live, or where you're moving to? Can you take care of their needs yourself? Will someone else provide those needs?
None of these facets of "just move" seemed to cross this professor's mind - or she dismissed my arguments out of hand because, after all, if you really wanted the job, you'd just move. This is ignorant at best and disingenuous at worst.