The cynic in me says that if standards were written this way, with no upper bound on data rate, symbol rate, bandwidth, frequency use, etc, then standards writers would soon be out of a job.
Just like the RS-232 serial standard originally was 300 bps, but now people use functionally the same protocol to talk 9600 bps, 57600 bps, 1000000 bps, 25,000,000 bps, etc... The original RS-232 standards group is long dead, yet the standard keeps going on because people can use the same spec (with a few tweaks along the way) faster and faster for 6 decades!
Just like the RS-232 serial standard originally was 300 bps, but now people use functionally the same protocol to talk 9600 bps, 57600 bps, 1000000 bps, 25,000,000 bps, etc... The original RS-232 standards group is long dead, yet the standard keeps going on because people can use the same spec (with a few tweaks along the way) faster and faster for 6 decades!