I'd certainly say it's negligence to duck critical high-level meetings so you can sort out your nonsense of a private life, and also continually send out terrible messaging on a regular basis which he did all the way through last year.
He's sort of stopped doing this now, a) because Stratton briefs him better than Cummings did and b) he actually does have some good news here and there to put out rather than making shit up, however they still have to watch him like a hawk 24/7 because as soon as you give him five minutes to himself, he either outright lies or makes a ridiculous promise that he's no position to guarantee. Neither of which are ideal traits.
It'll never be the "right time" for him to launch a proper inquiry so we either won't get one or he'll be long, long out of the picture by the time it even gets going let alone finishes. As he would be hugely unlikely to be criminally prosecuted for any of this (unless they make being a fat oaf a crime) then he won't care. Say you're looking five years down the line, he'll be nearly 60 and will probably just be writing shit books/articles and giving speeches at an extortionate rate, rather than running a country or doing anything important. Not his problem.