We built plenty of out-of-town shopping centres, business parks and industrial estates in the 70s, 80s, 90s. We stopped because it turns out they're, for the most part, shit. Given the choice, people will WFH and order off Amazon rather than go within a mile of these places.
What we need is to tackle the vested interests in the towns and cities themselves, as an example you can't grow most of our university cities at the edges without much better transit through the centres (trams at least, maybe metro rail). But the very suggestion and the preservation crowd as well as the existing suburbanites lose their shit.
And this is against a backdrop of rural and less educated people mistrusting anything going on in the growth cities, and I don't just mean London.