Sure Apple can make a single 5k to be connected to a mac. But when the rest of industry is going to dp1.3 or 1.4, the question is can you hook a 5k from any other maker to a mac or use Apple's display with any other computer. I'd assume that others are not interested in MST workarounds when there's easier way to do it...This its a capture from a pfd from https://thunderbolttechnology.net/sites/default/files/Thunderbolt3_TechBrief_FINAL.pdf Thunderbolttechnolgy.net
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So everibody argumenting against a 5K TB3 displays, this rebuts your saddest theories, TB3 Cinema Display is Coming.
Note the remaining 18 Gbps badwidth, enoug for 1 Thunderbolt 1 10Gbps data channel plus 1 USB3 5Gbps channel
Maybe Apple is using MST to keep mac users buying apple's displays or selling MPs if you want dual screens...