My best camera does 1080p at 150kbit/s H264. Most "4K" cameras have such shit encoding they're nowhere near exceeding what 2.4 GHz can provide still. And if I were to spend money on a nice 4K camera that actually streams real 4K I would also invest on making it run over PoE because that would chew through battery like there's no tomorrow and needs a power source anyway, and would go to an NVR to store it all on a RAID array.
And if that had to happen I'd just put it on a dedicated 5 GHz network, because I want to keep the good bandwidth for the devices that needs it like the TV, phones and laptops. Devices on older WiFi standards slow down the network because they use more airtime to send data at lower rates, so fast devices gets less airtime to send data at high rates.
Using the most fitting tech for the needs is more important than trying to get them all on the latest and greatest. Devices needs to be worthy of getting granted access to my 5 GHz networks.