I've worked for a number of airlines, and two examples spring to mind -
The first Cabin Crew cracked the doors open on the aircraft types that could (Boeings...) while the ground staff did the rest, or ground staff did everything for Airbuses. Cabin crew the completely closed the doors.
The second airline (Airbus only) had ground crew operating the doors as part of SOP's.
The incidence of blown slides at the 1st airline = up to half a dozen a year;
The incidence of blown slides at the 2nd airline = ZERO.
Absolutely great to have crew handling door's as much as possible, but it my opinion, it just aligns another hole in the cheese, by giving crew the opportunity to become complacent with doors. At the 2nd airline, crew touched doors in an emergency only, as as that is the only training we did, its all crew would think of to do. In an emergency, it may well indeed see a few more lives saved - at an airline where crew routinely disarm doors then open them, "auto-pilot" mode has indeed seen this too happen inadvertently during an emergency...