There is a point that maybe we need to do things a different way. All complaints aside, EPA regulates chemicals one by one: how do you even handle classes of thousands of chemicals?
Personally I would consider all of them unsafe until they are identified. Pretty sure that's how pharmaceutical drugs are handled so I'm not sure why it would be different for chemicals we don't know about. If the process is to slow then it's obvious the EPA needs a bigger budget and staff to work on this, instead of when Trump tried to cripple it even more than it already is...
I don't know how the EPA regulates in particular but you can describe PFAS by their definition which uses the common components that give them the properties they have.