its probobly considered really hazardous because you can dip something in the flask of molten metal (it would need to be a flask probobly with inert gas flood to be decent and not oxidized) and accidentally flick molten brass at something (like dipping a broom into water and striking it), quite a bit more impressive and flammable then lead splatter, since thats glowing.. regardless if its human or not you have a higher splash potential with really bad results
I can't even imagine it because my experience with torch brazing is tons of fumes from proper operation..
https://www.hitempbrazing.com/what-you-should-know-about-dip-brazinghere it says you need a molten? salt dip prior to brazing too.
here is a video
the salt tank and the equipment used looks like a general hell hole compared to a torch, some rods and a can of flux. i recommend you don't go to this method unless scale demands it. It probobly smells like shit and fumes alot and splatters and has you inhaling salt aerosols. normal brazing a rag and a pale of water is enough to clean up the excess flux and dross, with that setup it looks like you need 2 200 pound gorillas manning dust pans for the same effect lol. and look at the ridiculous gear they need to wear.