It has always been the case with these G's.<p>The consortium behind them has typically written up a laundry list of requirements that have usually been missed as each G has come online.<p>For instance, 4G was supposed to support a gigabit per second but the first versions of LTE did not. Later on we got LTE-advanced that built on LTE by channel bonding and increased levels of MIMO, just as 802.11ac built on 802.11n.<p>5G was talked up heavily by chip vendors for a few years before carriers started talking it up. 5G has such a huge list of requirements that it is hard to believe it can really be covered by one standard (extreme low-power IoT, extreme high-performance IoT, mm-wave powered fixed wireless, long range, small cells, something better for handsets, ...)<p>Carriers didn't talk about 5G because 4G was so great from a business standpoint because it was a great opportunity to raise the price for cellphone plans, but 4G is getting competitive now, so the telecoms have to convince investors they have something else underway. Like (ahem) getting the government to mandate safety systems for cars that need a cell phone plan or something...