I think, what makes music truly modern is not the "sound" but the approach. You can make very modern music with a piano trio or a string quartett, if your approach is a fresh one.
With Kamasi, I hear a sound, that is more contemporary than an acoustic jazz group, but the approach is very conservative. To me it sounds like an updated Buckshot Le Fonque. No problem with that, but it really has already been done.
I wouldn't think too much about the word "modern" in the McBride video. It is a great demonstration and the second solo and walking is definetely a more modern approach than the first one. I wouldn't think too much, whether it is "modern" in an absolute sense. What is that anyway? What modern is in a jazz context might be 100 years old in a contemporary music context and vice versa.
With Kamasi, I hear a sound, that is more contemporary than an acoustic jazz group, but the approach is very conservative. To me it sounds like an updated Buckshot Le Fonque. No problem with that, but it really has already been done.
I wouldn't think too much about the word "modern" in the McBride video. It is a great demonstration and the second solo and walking is definetely a more modern approach than the first one. I wouldn't think too much, whether it is "modern" in an absolute sense. What is that anyway? What modern is in a jazz context might be 100 years old in a contemporary music context and vice versa.