I am curious with "OSHA finally mandated ". I dug into the requirements specified by the label approved by the EPA on OA containers. It specified something called a half face mask without specifying requirements or mentioning OSHA. I derived the idea of digging into OSHA requirements to learn. My conclusion was it was up to the company, business, corporation or beekeeper to derive requirements for the particular activity and provide employee or personal protection as needed. Am I wrong?
The Rant:
I see it as a complete cop-out by the US government to specify anything it could be held liable ( or contradict capitalist interest. A typical position it seems. Strange thing is US military specifications (until deleted by Congress) were quite specific about requirements ( and quite good at it), not liable for lawsuits but subject to contract disputes. It just seems we have evolved into a strange environment IMO. A USA, were everyone is afraid of everything, dropped personal liability for anything and a refusal to build a strong, non-profit database. Wikipedia has merit as an information source.
OAV is left in limbo in the USA because it has no real profit oriented sponsor or manufacturer nor support from numerous non-profit organizations related to beekeeping. Europe, EU, takes a different tack on personal responsibility including a German report on OAV usage in an open-air environment at typcial beekeeping OAV application levels. Interestingly, the advent of faster and faster application rates and more complex application tools presents new problems.
So I agree with you -

- buyer beware and bee smart. I sort out my doctor's practical opinion about OAV risk. I made my safety plan based on all the data I discovered and follow it pretty much.