There are often issues beyond the obvious. For example, my partner's problems vary considerably. So actually doing paid employment is, in my opinion, impossible. She is able to do useful things - such as manage a website for a charity - simply because she can do that on an as-and-when-possible basis.
And where an employer might put themselves out to help an existing employee, even if it costs them real money, it is asking a lot to take on a new person in this sort of situation.