Divorces are expensive. Maybe they just didnt feel it was necessary, unless one decided to get remarried at some point.
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This is my guess. Not only expensive but in California they're a giant pain in the butt (in my opinion and from personal experience, unfortunately). Even lawyers I've known have had to hire other lawyers to handle it for them because they don't like you self representing, even when nothing is contested. In their case they would ay minimum be getting into property ownership and custody questions. Maybe they felt it wasn't worth it, or one or both didn't want people digging into all their life details. All MOO and speculating on possibilities.