As a guy who has a 4k as well as this one, the reason 4k uses MST isn't because of a controller it's because DP 1.2 and HDMI 1.4 can't push enough data fast enough. Nothing to do with controller's. DP 1.1 has no problem with 34X14
DP 1.2 has enough bandwidth for 4K.
There are several 4K panels on the market now that are single controller and do not use MST.
Anyway it has everything to do with controllers - that's why it is called Multi Stream Transport. You have two separate TCONs and the data stream is fed into each one. There's no reason the LG would be using MST though, as you point out even DP 1.1 has enough bandwidth for 3440x1440.
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