Private housing. Why do so many items break if you want to upgrade your house?

[Kuponutz]

I am trying desperately to understand why there are so many housing items that break if you take them up. I understand walls, lights etc, but why do I have to relinquish my Purification/Projection Modules, Lord of Levin Lamp and mail boxes, to list the main items?
None of these are fixtures.
Am I the only one who's rather frustrated that if I want to invest in a bigger house I have to lose minimum of 10 mil worth of items? Surely a bind to player and not bind to plot would be a better idea? If people move house in real life they get to keep the rugs
It makes me so sad because I really want to buy a medium but the idea of the amount of money I would lose by taking these items up just makes me sick
Is there any way we can get an official response from our SE mods to explain the reasoning and if there's any chance of this situation being changed in the future?