I would add that our town of Ashford, a massively growing kentish town with building everywhere. and I mean everywhere, and a International railway station, is a great example of what is happening to the high streets.
The out of town Sainsbury's has taken in store Argos, Timpson and Specsavers, with the former two closing stores in the town. Marks & Spencer have closed their store, with a new M&S Food Hall opening alongside, albeit 500 yds away from, the Sainsbury's store. Debenhams which is a purpose built, just 7 year old massive store, will close in 2020. Aldi have opened a store alongside the new Curious Brewery and facilities away from the old high street.
That is just some of those that have closed, or are about to close. This is happening as the famous out of town, McArthurGlen Designer Outlet Centre expands by 50 units!
Two years back another out of town centre opened to accommodate B&M, Tapi Carpets, Hobbycraft, Costa Coffee, alongside the existing TK Max, Dunelm, Boots, Smyths and Argos, alongside a separate Wickes, which all now having the massive and new Junction 10A of the M20 built on their doorstep.
We have also B&Q, PC World, Pets At Home, Halfords, and Dreams in other, away from the high street, centres.
So, that is just how one town, with a population growing from 118,000 in 2011 to 141,000 in 2021, which in the 1980's had grown to 87,000, is going. The lovely, nationally known pedestrian, friendly, free space high street which has seen it's own developments with yet another cinema complex and more coffee shops along with restaurants, is metophising probably more than most, but showing the way forward. High streets for leisure, banking and estate agents, along with coffee shops / restaurants, and little else.