When you hear about the environmental consequences of crypto, the massive amounts of electricity, the GPU shortages, that’s all PoW. PoS is designed to eliminate that and make crypto no more resource intensive than any other p2p network like BitTorrent.
Regardless of your view on crypto, there’s no defensible justification for the Portman-Warner amendment. It’d be like passing a bill banning electric vehicles but not gasoline, or shutting down solar plants but not coal plants.