6G may be
The greatest example yet of a solution looking for a problem.
What the heck problem is 6G going to solve that mmwave 5G does not? The standards people are pushing it because they have to push another generation or they'll be out of a job. The incumbents with big cellular patent portfolios are pushing it because those LTE patents don't last forever, and they need to create an illusion of inevitability about 6G so that by 2030 consumers will believe if they buy a phone that lacks 6G they might as well be using a landline.
There may be some niche commercial/industrial uses for 6G (though I struggle to think of any) but no one reading this will ever have a use for it in their lifetime. Any improvements they make for special features that are irrelevant to cell phones but might be useful in certain commercial/industrial settings (e.g. connection times measured in us instead of ms) could be added as extensions to 5G, similar to what LTE Advanced was to LTE. But no, they want to give us a full boat new standard, including using spectrum into the 100s of GHz so they can claim tens of gigabytes of throughput which no personal device could possibly need or use.
I look forward to the inevitable "640K is enough for anyone" replies from bozos who can't think of any reason for 6G to exist either, but just assume because we needed more than 640K we'll need more than 5G - ignoring that apocryphal 640K story was from very early in the lifespan of PCs, when cellular was 0G (i.e. pre standards analog) 640K may not have been enough for everyone, but the 64 bit address space we all have now in our PCs and phones sure is!