I'm disclined to go through anything with you as it's rarely a pleasurable or even polite experience.
But since you and some others disagree with my experience of gentrification, I'd like to figure out what the defining characteristics are meant to be.
This is Hulme, Manchester, probably in the early 1990s.
The hipsters and boho types of the time came, but they didn't revive anything, because they came at the end. Then much of the area was demolished. What's that if not top-down control? Now it's popular with yuppies and city commuters. So is that ultimately gentrification, or is it excluded because it's a particular failure mode, i.e. shit 1960s planning?
As another example, this is part of Southampton now.
Built from the mid-2000s onwards. Big influx of yuppies, ranging from lower middle class to yacht-owning nouveau riche. But before this existed, it used to be a dock, or in some cases, underwater. I don't think it was hipsters that filled in the Solent, but maybe it was. So, is it not to be filed under gentrification because there was no housing there before? OK, but it brought a load of money and property demand into the city, and around the corner which had always existed, it changed the local economy along the usual lines of old man pubs becoming bars and restaurants and so on, which looks a lot like gentrification to me. But in case you don't know Southampton, there's no burgeoning scene or anything FFS, there was never any great pull from culture. The buildings and availability of property came first, then the image of a particular lifestyle that it portrayed, and then the inhabitants, and then the things to service them.
Again, what's that if not top-down?
Now I can see the difference between (re)development and the more common sliding-tile pattern of gentrification, especially in places where the above doesn't work. For example it's not like you can demolish parts of, say, Paris and reinvent them - you would have to appropriate and alter what exists. Ditto elsewhere for different reasons. But most of what I see, especially in Britain, admittedly outside London, is not a slow subversion - it's new, often speculative construction that largely precedes and generates the influx, rather than merely reflecting it.