I think you have to look at the strategic intent, Adam. I know you refuse to accept that the primary purpose of the Labour party is to gain power in order to implement its policies and you think that it should remain an impotent protest party enabling a massive Tory majority which in turn enables an unopposed enactment of whatever policies the Tories choose, but maybe just try for a moment, eh?
He sits in the Corbyn legacy of the worst electoral defeat since 1935 ( I know you try to present 2017 as a Labour victory, Adam, but I'm afraid it wasn't. The Tories win. With a majority). He cannot win on Brexit for very obvious reasons. He cannot win in a left-wing agenda for very obvious reasons. He cannot win by taking up the culture war for very obvious reasons.
So what is the ground on which he can win? The Tories preferred ground. He is even stealing the Tories slogans from them. Before you start squealing that Labour are just another Tory party, Adam, re-read the first paragraph. Also remember that that is an identical claim that people like you were making in 1997 about Blair. Then remind yourself that without Blair we would otherwise be looking at 43 years of constant Tory rule. You can't bend political reality to fit your own desires, Adam.