This. It is very common for guys who are out of work to be much less productive around the house despite having more time available to dedicate to housework. Tons of guys are not brought up doing housework and being detail-oriented about this stuff, so in a lot of relationships where the guy is at home more often (for whatever reason), he doesn't know how to pick up the slack at home.
I'm not saying this is because those guys are dumb or lazy or malicious; I have trouble with it and don't consider myself those things. My girlfriend and I try to split stuff up evenly (we both have jobs and neither of us likes housework, so we try to be fair), but I still find it hard to remember to do certain things that she has been doing for years (e.g. remembering to clean the toilet bowl), or I will not prioritize certain other things that she makes sure to do promptly (e.g. I will wait longer to do laundry). I am trying to pull my weight, but I can definitely tell that I am catching up to her in housework productivity. And, from most anecdotes I hear, this is a very common (though obviously not universal) phenomenon.
This is not to say that there are not other things wrapped up in this (people are attracted to roles, and I am sure plenty of women in traditional subcultures find jobless men just plain unattractive regardless of their value in other dimensions). But I can definitely see why someone who is already going to have to raise and provide for a kid would be reluctant to bring another person into a lifelong relationship when that other person (judging from widespread anecdotal evidence) will very likely not be much help at home while also not contributing a paycheck.