802.11ax is adopting many of the advantages of cellular LTE which has been very successful in urban areas using frequency division multiplexing. By using smaller channels its enables more aggregate performance.
802.11ax will be anywhere from 4x to 10x faster than existing 802.11ac, but the wider and multiple channels greatly increase throughput. Speed is increased by 4x using wider 160 MHz channel. The equivalent 802.11ac connection will be only 866 Mbps.
Using a 4×4 MIMO access point , 802.11ax can aggregate 14 gigabits per second. A 802.11ax client can reach gigabit speeds with 2 or 3 channels. In the most crowded areas using 40 MHz channels, 802.11ax can deliver 800 megabits per second.
Mobile machines will benefit from 802.11ax as it uses less power by switching the Wi-Fi off and on using millisecond timing.