If we want to update our cell phones or TV etc., we don’t get one/another for free because we have an older model, (I wish we did). 
We have to buy a new model, if we are lucky we might get a trade-in that’s not worth much. We get a brand new model of an airport, (because it is software) we treat it differently and expect it for free even though a ton of expertise clever design and time has gone into producing it. All the buildings at MK Studios, Dublin v2 are built again from the ground-up with a ton more detail. Some terminal interiors are included too, (this is something I personally can do without). This is great for screenshots and videos, probably not for performance.
Charles.