Plus, the partner who's not working has some very real imputed salary value. In fact, the economic value of a non-working partner is much higher in a high cost of living area than a low cost of living area. If they save you from paying for professional childcare, the expense saved may be $4K/month rather than $500/month. Ditto for other services, especially meals at home.

As a Canadian who did three years of immigration horseshit in the US with a non-working spouse, the real issue is that your spouse is making a huge sacrifice of their freedom. Being a kept person can chip away at your sense of self-sufficiency and self-worth. The people I met in my situation all left the country (the majority) or had kids (one couple).