The assumption is that introducing a bill to regulate dark patterns is the same as "moving fast". This bill hasn't even made it to committee [1] and darkpatterns.org was started in 2010 [2]. I think an argument could be made that the US government is actually moving pretty slowly on this topic. GDPR has been in place for over a year, so there is significant data to understand the implications of this type of regulation.
==and fix broken regulations later.==
How is this different from a software product releasing an updated version? Microsoft Excel is on v16 and I don't think anyone is accusing that product of moving fast and breaking things. I wish we spent more time adding features and fixing bugs from past legislation.