holy smokes, what an interesting thread to find!
Significant others come and go, that is the way of things, but your hobbies sustain you. I couldn't imagine choosing to be with someone who wasn't slightly interested in my main hobby...they are living things, you can't just pack them away in the closet for a year or so to avoid arguments.
And I'd hate to have a partner that couldn't be trusted to care for them if I was sent to the hospital or something. Accidents happen, why have a partner that doesn't take care of you and yours? Isn't that why we partner up? Someone to share things with?