Allow user to create a Target Asset Allocation (the akin of a Budget when thinking about Spending) and compare current Allocation to that Target.
e.g. 30% Investment, 20% Real Estate, 30% Private Placement [a category that doesn't exist in Simplifi yet], 20% Cash/Current Accounts.
It'd be helpful to also add in specific accounts (e.g. "Chase Checking") to this list such that you can mix categories and specific accounts (tricky to avoid double counting, I realize).
Finally, it'd be further be helpful to assign a target IRR to each category where one can compare actual performance to target.