Those tabs serve different purposes though, If I want to see what I still have left to pay in the month I go to Summary. Scheduled payments have a multitude of different kinds of payments, some recurring some not, and with different payment frequencies.
Would you also mark one off scheduled orders as paid or remove them completely as they currently are?
I personally like the Scheduled payments screen as is, they are ordered by next payment date so the next expected ones are at the top and you can see at a glance what is next going out. Once paid they either disappear (if non-recurring since obviously it is no longer a scheduled payment) or get rearranged somewhere into the list.
I would personally vote against this, I like it as it is.
Edit to add: I do think some work can be done to Summary page to include scheduled pot payments which are currently being ignored unlike other schedule payments.