I'm not really into nitpicking details in Star Wars, that's a bad path to go down if you don't want to drive yourself nuts, it's all a big inconsistent mess. Just trying to understand the general direction Disney seem to be taking the franchise with the new media they're producing, which doesn't seem to prop up the idea of Stormtroopers as elite military as well as the EU did.
I mean, the OT does plenty of work towards showing how incompetent the Stormtroopers are as well so I wouldn't call it the most consistent source ever.