There's an article in the BBC History magazine this month about Houses as living things, by the bloke who does that House In Time programme.
It's good for houses of each period to be preserved for posterity, so we can see how people lived. They are essentially museums and people don't live in them.
For houses which are lived in, changed need to happen to reflect changes to the way we live. I agree that it's good to keep period features which can work with modern living. However, I think there will be some which need changing - no inside loo would not be acceptable these days, and I'd think the kitchen in this particular property wouldn't fit with modern living, so I wouldn't expect a sympathetic buyer to live with it as it is.
The particulars of unmodernised houses are a great historical source in themselves that I'm sure estate agents don't see that way. Even if the features are changed after sale, the pictures tell us lots about how people lived - brilliant.
I love to look at lots of the features in this house, but I wouldn't want to actually live with them. But it's a Q of how far you go isn't it. Yes, probably bifolds and decking or a big patio will be put into a big open plan living kitchen. It's a lovely big house and could lend itself to that although it would be a shame in lots of ways, it's a house for families to live in and has to keep evolving.