DECT-2020 aka DECT-NR+ looks cool. Basically just used the name, is how I once heard it explained, with really nice modern low latency communication. https://en.wikipedia.org/wiki/DECT#DECT-2020

And the spectrum has a chunk of bandwidth, just for DECT! That's used less and less. That this new modern protocol can use! Neat.

I haven't bought it but I do keep thinking I might try getting an nRF9161 devkit or whatnot that has support for for dect-nr+. I want to build a wireless mouse with it.