Just because I want to get to a point where I could cover everything comfortably on my own doesn't mean I particularly want to be placed in the position to do it.
But I will just say, with different responsibilities come different expectations. Meaning, if I'm the sole breadwinner, then what I expect of my spouse from a support/role standpoint would be quite different than what my expectations would be if we were tag teaming these motherfukkers.
That said, to answer the question ... it's not my business how other people do things in their households.
If it works for them, it's effective. I can't be mad at it. I probably wouldn't get down like that, but to that end I wouldn't co-habitate with someone unless I couldn't picture a future without them in it, i.e. we're in for the long haul. I'd be more likely to want to cover all the things if it was a wife we're talking about as opposed to a serious girlfriend. But it all depends on our mindset and how we're trying to build, etc.