I should know better than comment on a safety, specially (trying to) making the same point again, but on any safety concern, I believe you have to take into consideration who you are dealing with.
That is, if you call the hall for a Journeyman Ironworker/connector, then you might have to give him a brief rundown of any rules particular to that job site, but for the most part he should be safely hanging iron by mid morning. But, if you send the 19 year old office girl/parts runner to the job site with the payroll checks, then it might be best to not let her drive over there without a pretty good discussion of driving around cranes, trucks, scrappers, dozers and the many hazards of the site. And she doesn't even get to think about going up a ladder.
So the salty old dog who's spent 35 years welding pipe (and wears a hood that's older than me) doesn't get a second glance if his beard reaches ZZ Top dimensions. But the new welders helper will be thouroghly informed of the hazards that might reach out and grab him by the hair.
My personal experience setting my facial hair afire is extensive, and I've always found that it won't support combustion on it's own, but that's too anectdotal to base a policy on ;)
JTMcC.