When it comes to U.S. laws that touch technology, enforceability is a mess. Spyware, spam, fraud, misleading labels, etc. are already governed by various state and federal laws, yet enforcement efforts are whack-a-mole at best.
For IoT devices, having the proposed requirements sounds good in theory but I fear it is practically unenforceable, particularly for consumer-grade devices manufactured overseas.
However, if powerful IoT platforms are also tied into the new regs - with Google, Amazon, Apple, Microsoft, PTC, HPE, etc. required to audit supposedly qualified devices and ban those that don't meet the standards, with escalating penalties for failing to do so - that might shift the needle.
My 2 cents.