I'm not convinced that the Tour has not been a high priority. One only needs to see how highly strung he's got in the past to see that this is a key thing for him.
Now, however, he's got a bunch of wins. He's a World Champion. Winning the Tour won't make such a massive difference now as it would have done when he had pretty much 0 big wins to his name. It allows him to be less highly strung about it, too, which seems to be one of the key things. Quite often in the past, he seemed to struggle with some of the mental aspect of the sport, quite possibly for the reasons you outline above. Now he seems more attuned with his goals, whether that be because of pressure being off, the change of teams or whatever.
The change in racing strategy is something of a misnomer; Cuddles has attacked in the past, many times during the era in which he was derided as a wheelsucker. But what has changed in the attacks is twofold.
1) He seems to time them much better now
2) He seems far less likely to get the sulks. Times like the 2009 Dauphiné on the Ventoux, it felt like he got fed up nobody was going to help him and just rode through; by the 2010 Giro we saw similar situations develop, but Evans riding across the gap, not being afraid of pulling people along.
It's been a gradual process, but the Rainbow Jersey victory is what we can point to as the tipping point. He's just seemed like a changed man since then.