We don't have a joint account anymore basically because we didn't really use it, but we do share everything and although we have individual accounts we don't really view money as 'mine' or 'his'. Now that we both use online banking (both with the same bank so even easier) we can transfer instantly between us, so when something needs paying for it just comes down to who happens to have the money for it, whether it's something for just one of us (eg clothes), or a household expense, or something for his older children.
We are on a low income, so we don't really have much money for personal spending, and we now have 'pocket money' (both have the same token amount) for frivolous stuff. We are saving hard for a house deposit and some is in my name, some in his, but it is all ours.
We never really considered not sharing everything, it just evolved naturally. We are totally on the same page WRT our aims and spending habits, so it works. By the way we have had DH working FT and me a SAHP, to the opposite, and all manner of combinations in between, due to illness and injury, job hunting and redundancy. There was no way either of us would see one type of contribution (work/money vs caring responsibilities) as more valuable than the other, and perhaps this is partly due to all we've been through together (eg when he suddenly lost his job due to his injury), there's just no point in viewing things in strictly financial terms.
Different strokes and all that though. TBH it's amazing that DH has so much trust in me, given that his exW (who was abusive so not an otherwise happy marriage) ran up huge debts in his name without him knowing and obviously this led to a lot of problems for him. So in a way perhaps that helped us come to think of it, as it meant he was very open from the start about how he felt about money, spending and borrowing etc.