I’m with you on the first part - I never fully turn off my devices either as it seems stupid and unnecessary. Can’t wait for these recommendations to be fully adopted.
Your second statement is ludicrous however. Air flow through the cabin is controlled by the air conditioning packs in the engines and there is simply no advantage to “recycling” the air as you claim.
Go right to the source for information: http://www.boeing.com/boeing/commercial/cabinair/facts.page
