I guess I just don't get why an antique fireplace for example is 'better' than one that was built two years ago. At some point those will be the antiques. I don't know, the year something was built just seems like an arbitrary thing to me. I suppose maybe I should look at it from the point of view that it's destroying something needlessly, which I don't like.
I don't think it's even a case of what is 'better', as opinion and taste will differ from person to person. It's just that, if something is limited (no more being made), it seems quite odd and selfish to buy it when you don't want/like it and others do. As PP have said, a period house comes with period features and is just spoilt by being bastardised so that it's neither period nor modern anymore.
It might be a bit of a strange analogy, but I would kind of compare it with those protesters who went into supermarkets and tipped the milk all over the floor (although they hadn't even paid for it, unlike the house buyers, to be fair; but also, the milk supplies aren't finite). Some people in that supermarket wanted the milk and put it into their trolleys to buy - fine. Some shoppers didn't want the milk, so they left it on the shelves - also fine. It just seems so strange and selfish to buy/procure/take something that you don't really want when others do want it.
As another milk-related analogy, remember when milk was hard to get hold of during the pandemic/panic-buying times, and some people without children were taking all the formula milk off the shelves and buying it for themselves, to use in coffee. They would have quickly realised that baby formula is nasty tastes nothing like standard powdered milk that an adult would like, and meanwhile, the babies were being deprived of the only food they could eat. All in all, nobody won, really.