I don't know what happened to the C5 - still vaporware 18 months after announcement.
There are plenty of home users with 5Ghz only networks, which in turn means anyone designing an IoT device will get user complaints and returns from all these users.
really? is this a configuration that some ISPs are shipping in their routers, or how is this happening? i've never heard of anybody with a 5GHz only home network.
But ISPs? Router manufaturers? No way in hell, why would they self-impose additional support burden by preventing the customer from connecting their 4-5yo old low-end laptop or their shiny new smart bulbs or their brand new Amazon Kindle?
Is it? Are there any competitors in the class have 5ghz support? Most of the radio MCUs I've seen are all 2.4ghz which includes thread/zigbee/wifi/etc.
Every IOT device I've ever seen is 2.4ghz