Anyone who thinks that emergency depressuriation is a piece of cake needs to look at
http://www.aaib.gov.uk/cms_resources...pdf_501410.pdf
There is scarcely a higher workload on any flight crew, including the cabin crew than an emergency depressurisation. If pilots start an unannounced emergency descent they are going to cause havock for airliners in all directions travelling below them. So they have to get out a pan call or even a mayday if they need to get the controllers undivided attention (often no mean feat at the best of times), and they have to do that while donning their flight crew masks and at the same time trying to see if there is an immediate fix for the cabin pressure. When they can get clearance they can start their descent. If not they can try to escape sideways into safer airspace for a rapid descent. But their first job is to try to prevent a potential crisis from becoming a major calamity. They must follow the age old lesson that every pilot is taught, aviate, navigate, communicate. the BBC and the media should note the accepted position of the need to communicate.
The cabin staff equally have a very high workload; they have to get their hands on an oxygen mask immediately; they must rush to make the cabin as safe as possible bearing in mind that they may be serving from trolleys (can you imagine hundreds of soft drinks cans and bottles climbing from 8,000 feet to 39,000,000 feet in a few seconds?), and then secure the galley to prevent calamities there.
For both the flight deck crew and the cabin crew this cannot be any time for PA announcements.
The above link stresses the urgent need to see to yourself for oxygen before helping others. One anoxious person helping another does not work.