This happens with guitars, cars, houses…any item which has both historical and function value. The original owner of the item makes numerous small changes and

This happens with guitars, cars, houses…any item which has both historical and function value. The original owner of the item makes numerous small changes and repairs over decades which preserve and improve the functionality. They finally sell it off to a collector who reverts all the changes, degrading the functionality in order to restore some notion of authenticity. And sometimes they go further, fixing “mistakes” made by the factory. In this case, the functionality of a Z80 is so ridiculously outdated and obsolete that I suppose authenticity (and nostalgia) is really the only point.