“The current baud rate limits were adopted in 1980.”
Hams below 28 MHz are still capped at 300 baud, a rule written at the dawn of digital radio. ARRL asked the FCC to swap it for a 2.8 kHz bandwidth limit in 2013. The FCC proposed it in 2016 and is getting around to a vote in November 2023. Ten years to delete a speed limit the agency already waives during disasters.