If homes were not treated primarily as investments, I don't think you'd be spending that much.

And note that this isn't about things depreciating and falling apart. It's more about various policies that affect house prices indirectly. The existing arrangement, when you distill it down, pretty much means that once somebody becomes a homeowner, they have an economic incentive to make home ownership for other people as hard as possible, because it props their investment (and if they own more than one, and rent some out, lets them raise the rent higher).