They haven't forgotten it, and they aren't only doing dual frequency: it's available in their higher-end products, U7 Pro and above. They've left out 6GHz from the U7 Lite to save cost and/or to persuade people to buy the more expensive models.
Many other vendors (including ASUS) appear to be leaving out 6 GHz in the UK/European models, but including it in the US/Asia Pacific. I can only conclude this is because Ofcom and the EU regulators have only allocated 50% of the 6 GHz capacity the other regions have.
i believe just like the 5ghz area, its split, so you will typically have 5ghz 1 (lower frequencies) on one radio and 5ghz 2 (higher 5ghz frequencies) on the other



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