Policy U-turns that the left interprets as surrender to a Blairite revanche are construed by the leader’s allies as rational choices by a man who wants to win an election, has looked at the evidence of how it can be done and will be ruthless in taking down obstacles in his path.
They were the result of not spending enough money, and going for the cheapest options available (then using them way beyond their intended lifespan in the case of RAAC), not overinvestment.
But I don’t want to draw out an argument, so let’s just agree to disagree. I hope you’re right though.