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I think that's quite insightful (and in turn remarkable: because it comes from "fakenews" Vox)
I think he's in his element on domestic opinion issues/talking-points but anything complex and outside his sphere of ... um ... expertise (fucking lolz) ... he's just not really interested. Sad!
There is a theory (pushed by Bannon now he's back to his old tricks?) that Ivanka getting upset with footage of dead Syrian babies, white nationalists with tiki torches and issues-of-the-day plays a role in The Donald's opinion.
Quite an interesting theory.
https://www.vox.com/platform/amp/policy-and-politics/2017/8/18/16169464/steve-bannon-fired-donald-trump
Without wishing to make too tenuous an analogy, the comment "we’re watching a president who wants to comment on his own presidency without actually driving its agenda or being held accountable for anything he says" reminds me a little of Cameron (remember him?), who only ever seemed to operate as a PR person for 'his' government (i.e. he would talk about what was happening but never seemed to stand for anything substantial).