Why do you assume innovation and new frequencies are all that related. There are some things new frequencies can help with. Higher bandwidth, lower congestion, but there's also problems with penetration and range. Meanwhile, the protocol itself is packed with modes and features.
Range is a great metric to advertise. Like a cord on a tool that is 30% too short, bluetooth could air clean audio a little further. 300 feet in open air helps with field practice, yard work, etc. where transmitter is further.
