Yeah that's the idea, so the corollary is: when adding a new poi, check for an existing node (maybe tagged with disused: or construction:, maybe shop=vacant, maybe just an address) before creating a new one.

It's not always so clean -- sometimes there are multiple businesses in a single space, sometimes storefronts divide in half or absorb neighborhooding storefronts. But to the extent that we can map in a way that keeps the history intact, we should.