The whole presentation of slot positions for Insert and Sends etc needs to have a rethink.
In N5 it was possible to choose a slot position for a particular type of insert. For example I could always put the same type of effect into Insert slot 7 and thereby see at a glance whether or not all relevant tracks have been given the right effect. I would often leave Insert Slot 1 empty on vocal tracks in case Melodyne was needed because that is where it likes to be.
In N6 this seems to be impossible - there are no slot numbers and it seems to be impossible to see all 8 slots at the same time, unless one of the tracks has 8 inserts/sends assigned to it. If a track has no inserts, the first one assigned HAS to go into slot 1, the second HAS to go into slot 2 etc - this is far less flexible that the previous versions.
Perhaps one way round this would be to add a dummy track to every project and fill all of the slots with something - that way all real tracks would display all available slots (although sadly they would still have no visible slot numbers and all be black as coal) - I know - It’s crazy!