WHBM,
NO, NO, NO, A MILLION TIMES NO!!!!
Sorry - I may have over-reacted a tiny bit there
; but they used to do this at the old T1 at CDG (might still do - haven't been there for a while) and it was a nightmare.
It used to take ages to get through security, and because the staff would have to move from gate to gate, there would be a queue at the gate before boarding, and on more than one occasion flights I was on were delayed because they couldn't get all the pax through security in time. Then, once past security there were no facilities whatsoever in the holding pen (and I chose that word deliberately).
In fact, it got to the stage where it was quicker and less stressful for me to drive from the centre of Paris to Didcot via the Chunnel than fly from CDG.
So I can't see any benefits - but I'm an open-minded sort of person. What would be on this lengthy list of yours?
Best Regards,
Atlantean.