Grant Fritchey shows us something that the SSMS tools team snuck in on us:
One of the many new sets of functionality introduced in SQL Server Management Studio 17 is the new option “Analyze Actual Execution Plan.” If Microsoft continues down this path, there will be a lot of useful functionality at some point. If you haven’t yet looked at Analyze Actual Execution Plan, well, read on.
I hope they do expand this out. I can see it being very beneficial, but it needs to look at a lot more than just cardinality estimations.