Good points.
I don’t think any of us are arguing to put everything back to a point before mankind started to radically change the environment but simply not to mess with things as they are now (as far as possible) and when it is messed with to put it back as it was. In the context of this thread that means filling the hole created by an open cast mine and returning the landscape to what it was before it was mined - not creating a theme landscape that many are unhappy with and one that’s unlikely to last for more than a few years.