I think most insurance can pass via “domestic partnership” now.
But pensions can pass via marriage as can SSN and veteran benefits. If I marry a combat vet, I can get decent benefits for nursing home care which comes in handy now that LTC insurance is disappearing.
Right after Georgia allowed 'domestic partnerships' and mandated that insurance be allowed for those partners, I toddled right into the HR office, and demanded my live-in girlfriend be covered under 'domestic partnership'.
The HR chick was like, "I don't think this is meant for that....I think this is meant for homosexual or lesbian couples...."
I responded, "Please point out in the legislation where the words "homosexual", "lesbian", "gay", or "same sex" is used. You won't find it. What you WILL find is the phrase "domestic partner". That's what my girlfriend is. Cover us or be sued."
My gal got her coverage.