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...why, even in the court systems, housewife's position is considered as a FULL time job?
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Because it was, one hundred years ago, when these laws were written. In those times a woman had no modern, work-saving conveniences and appliances, had an average of six children in the house and usually had to get up at 5AM to milk the cows and make breakfast for "the hands"! Politicians will never reform a law in any way which reduces any "giving" to anyone. This is because they consider the people (perhaps rightly) to be morons who never stop to think that the courts don't have anything, to "give" to anyone, until or unless they first take it away from someone else!

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Too late... He filed for divorce...I'm stunned.
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Well, you had it made and you blew it. Now you will find out in what way(s) he has protected himself and his assets.

You traded known security and his acceptance of his understood, and clearly agreed, obligations to you for the miasma of divorce and false visions of grandeur--all because of greed. In the event that the divorce is "bitter", and he believes that he was "screwed", I wouldn't want to be in your shoes.