Honestly what's unsaid in a lot of this is that it would be really nice if there were more and wider ISM bands. So much makes use of 900Mhz, 2.4GHz and 5GHz in novel and innovative ways, that if the government and FCC really actually wanted to spark innovation including augmenting wifi performance, they'd stop letting telcos and other questionable interests hoard spectrum and release it as ISM (and no, they shouldn't steal from ham bands to make ISM bands either).
WiFi 6E added 6 GHz spectrum bigger than 5 GHz. The problem is that not that many devices support it. I think it is required in WiFi 7. I think it is shared with other users so devices have to find free space. I think most developed countries have allocated it.
