[kmlx]

We don’t move to higher frequencies just because we’ve run out of ways to pack more data into lower bands. The main reason is that higher frequencies offer much wider chunks of spectrum, which directly leads to higher potential data rates. Advanced modulation/coding techniques can squeeze more capacity out of lower bands, but there are fundamental physical and regulatory limits, like Shannon’s limit and the crowded/heavily licensed spectrum below 6 GHz that make it harder to keep increasing speeds at those lower frequencies.