If OP gets divorced - half the assets will be split - she won't have the problem of negotiating with anyone and will receive a spousal settlement.
Incredibly naive to assume this. I know plenty of SAHM/housewives who have been screwed over by their DH's in the event of a divorce. Marraige doesn't give the protection that many on MN seem to think it does. Also why are you assuming that OP's DH is such a high earner that OP would be quids in if they split? Maybe they're just about managing now and if they split she'd have to go out to work to support herself anyway! But yeah sure, OP should definitely throw away her marriage over this.
Basically the pay she should have had for all the unpaid work she has been doing for the past 15-20 years odd.
The "pay she should have had"?? So a roof over her head, bills paid, food to eat, the continued financial security of her DC and basically her entire life being paid for by another person for the last two decades isn't payment enough? You think her DH should have been paying her a salary on top? For doing things that working people manage to fit around their jobs? Unbelievable.
And then she can choose how much housework she does. And have some say in further training without the burden of her DH telling her what to do.
I love how people are making out OP's DH is some kind of misogynist tyrant who has had her chained to the kitchen sink and is now sending her to work down a mine or something!! There is nothing in the OP to suggest that. For all we know he already does plenty around the house and just wants his wife, who has had the luxury of not working for 18 years to get a job for a few hours a week to contribute to their pension pot so he can retire at some point before he keels over. But of course, she should definitely LTB rather than suffer the indignity of having to get a job!
The mental gymnastics some posters on this thread are doing to justify their view that once a woman has given birth she is entitled to have her life paid for by a man forevermore are mind-boggling.