Very few accidents occur as a result of spending more time readying things after push back. A considerable number of accidents happen during taxying, not least as a result of distractions associated with checklists.
One outfit I know of - another airbus operator, have the crew do a full flight instrument check, which takes about 25 seconds to recite, during taxying. During this, both pilots are meant to cross check ASI readings, V speeds, autopilot and flight director status, heading ( four times) etc.... At the same time, both are meant to be monitoring what is going on outside. Talk about looking for an accident to happen.