Er, really?
I connect flights all the time and cannot think of a single occasion where I've not had to be screened a second time at my transit point - that includes CDG, LHR, FRA, AMS, and AUH.
If passengers are not routinely re-screened then I'm clearly exceptionally unlucky. I think my record was five separate security screenings on a flight KWI-FRA-DUB (and okay, that one originated in the middle east, but still...)