In reply to Andreas Nurbo.

aristah: Why would you not want instant preview of the changes the user is making? The possibility of instant preview is what is good with the Customizer. So why would I not want to use the postmessage stuff? At least for most things. I use it for most things anyway.

chip: I dont doubt the improvements. I just dont see them as such revolutionary improvements as you seem to claim. I like the capability stuff and the controls.

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I work mainly with plugins so I write Settings API stuff regardless unless I would want users to go to Customizer to change things that has no need for preview. This just seems like more fragmentation. Instead of improving across the board with a single system we now have two separate systems (or rather three or four depending on how one counts). Just like we will have two separate systems for managing Menus. There are also duplicate areas for a bunch of other settings. I find the whole thing to be a sign of no direction. Core people just tinkering away with no set goal or leadership.