There are legal interpretations of the federal law that conclude that the federal ebike regulations do not limit assist speed so long as the rider is pedaling (there is a clear assist limit under throttle only) so I have no idea how People for Bikes can advocate Class 1 & 3 state regulations that are not consistent with the federal regulation.
They are a lobbying organization funded by the bike companies, they only want to make it easier to sell ebikes, they aren't concerned with usage, or what is the most logical way to make it all work.
I doubt anyone will challenge the state vs federal law thing because no one cares enough, no one riding and no one enforcing.