In your indefatigable search for something positive, you omit three things:
1) Filing an application is incredibly burdensome. Many manufacturers will not bother. Some may not even register, and just hang up their hats when the regs become final. This will yield an immediate ripple effect on vape shops and distributors plus online sellers. We could even see a stampede out of the market.
2) FDA can refuse to accept an application. Bill G. says that they've done it before. I'm not sure on what grounds. I'm not sure if they're refused to accept registrations (but registrations have to be in at most six months after the rule becomes final, depending on the date of finalization).
3) Given how burdensome the application process is, FDA could easily filter out the applications that don't make a serious effort to comply with the requirements for all of those studies, etc. They are not mandated to process them in order of submission.
+1 for "indefatigable".
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