And so we will get a slew of headphones that have BT6 radios but do not support better codecs. The original Lc3 codec is hard to find. The aforementioned Edifier only supports SBC. And that is because the source devices that support it are very rare. It is night impossible to get any better codec (LDAC, LC3, aptx) to work on Windows. Anything mobile will either have a version of aptx on Qualcom or some custom codec from a Chinese manufacturer.
This is why no one is rushing to put new radios in. It simply does not bring any improvements onto the table aside from potential better efficiency.