MST Support but no support for daisy chaining?

For a while Apple supports MST (Use 4K displays and Ultra HD TVs with your Mac - Apple Support). Since this was supported, I was stupid enough to assume that daisy chaining would also work (part of the DisplayPort 1.2 specification). Seems I was wrong to assume that if you say you have Thunderbolt 2, that you also would support DisplayPort 1.2, which is part of the Thunderbolt 2 spec (https://thunderbolttechnology.net/sites/default/files/Driving%204K%20Workflows%2 0with%20Thunderbolt%202.pdf). And with that you would have MST not only for driving 4K displays, but also for driving multiple displays in a daisy chain (which is supported in the Thunderbolt Display setup).

I've a Windows/Linux desktop and my MacBook Pro and I hoped I would be able to use daisy chaining to switch display between the two by just switching 1 monitor. Unfortunately it seems apple does not allow for this (read: they didn't add this when they added the MST support). And daisy chaining is also very nice in keeping those rare thunderbolt ports available for other stuff then displays. Yes of course I should have bought a thunderbolt display, but since the hardware is capable of doing the daisy chaining (people have used bootcamp to prove that), why not add it to the drivers?

Is anyone aware of plans @ Apple about adding this to their drivers? After googling since it didn't work I found that many more are interested in seeing daisy chaining to work.

Some of the many related topics:
http://apple.stackexchange.com/questions/189542/mbpr-2015-2-5ghz-i7-daisychainin g-2-dell-u2414h-61-screens

http://superuser.com/questions/228589/daisy-chainable-displayport-monitors/

Daisy chain Dell u2713h

DisplayPort 1.2 MST (Daisy Chaining) on 2013 MacBook Pros

Daisy chain two display port monitors (Dell U2913WM) to new Mac mini Thunderbolt?(This one is originally about Thunderbolt 1, which is not DisplayPort 1.2 compatible, but it shows for how long people want to use daisy chaining, and the last reply there is from Oct 15, 2015 9:26 AM)

Does the new Macbook Pro 15" (late 2013) supports 4K via Thunderbolt/Displayport?

http://gizmodo.com/i-think-my-next-computer-will-abandon-osx-for-windows-1-17149 40452

https://www.reddit.com/r/applehelp/comments/2qppmh/thunderboltmdp_daisy_chain_on _nonapple_monitors/