It seems to be drilled in from an early stage though, I dont think theres anything Johnson and co can do about it - which is kinda my point.
You'd spot the odd good player who would do things off-the-cuff when we played these schools but the majority were making calls off the back of 3rd/4th phase ball and eventually they'd run out of ideas. You can almost see the exact parallel with the national side now.
We had our set plays of course, everyone did, but the difference was (I believe...) we were encouraged to drop them should the opportunity arise, where-as the RFU schools would stick to them rigidly - perhaps that mentality has crept through at the top level now and you've got players who, while technically are very very good, are weak when it comes to broken play and having to make key decisions at key times... as you say, such as altering a game plan in accordance to the conditions.