You make it seem like it takes effort. It doesn't . We are together 24/7 now that we are retired. So we are both at the grocery store and see what goes in the cart. We go with each other to do clothes shopping and value each other's opinions on how something looks. We've been married 40 years, we were pretty much of the same school of thought then, and WAY more so after 40 years. We don't make many purchases over $100 and I can't remember a disagreement over whether we should buy something or not. We decided it was time to remove our wood burning fireplace insert and put in a "fake" $2,700 electric fireplace insert. We talked about it, We shopped. We found a unit that we liked, we bought it. No need for autonomy there. My wife wants to buy our Granddaughters a playset for their new home. We talked about it, and we agreed on a price range, but their parents want to get their backyard landscaping done first, so that is on hold.
How did we end up like this?
For me, because it was because it is what my parents did.
For my wife, because it WASN'T what her parents did, and why they ended up divorced.
It's not bizarre, it's what people who are sharing a life do.