It would be really great to be able to collaborate on finances with your spouse, without having to expose all of your expenses into a single budget.
For example: We manage our budget by having a shared account that we use for most expenses (groceries, house payments, travel, etc). But we also pay into personal accounts to give ourselves some freedom to spend as we please for personal expenses (new golf clubs, toys, makeup, etc). It would be nice to be able to collaborate on a single budget, but be able to only see the expenses that are shared into certain categories.
My personal category expenses would only be visible to me, and her personal category to her, perhaps with an ability to share or hide the total category $$ .