Thanks for explaining your mapping style.

I added 3 items to the map to improve it -- whilst retaining the 1 item that was previously mapped.

There are others that are equally valid.

I map the area that each business occupies (or the best approximation).
This has a number of advantages:
- it's easier to update than POIs
    - POIs are just some random location -- not even the centre of the item
    - it's more difficult to delete a POI, since you can never really be sure that it's really gone, or did you just miss surveying it.
- There is an intrinsic relationship that can be used to determine the importance (based on area) that can be used by renderers.

In this specific case, I expect the building units to have different numbers (at least). You's issue that changing > 1 item is difficult can be solved -- at least in JOSM, you just hold shift when selecting to have multiple objects.

So, I hope you can see why items have been mapped in this changeset.

If you still consider that there is a problem, then there is a third potential mechanism which is to use "indoor mapping" to map each business as a notional room inside the building. It means that the building can be one area, while business are areas internally. I find rendering isn't so great -- but it does keep the advantages of area mapping, together with the ultra-pure-semantic approach of keeping the building as a single entity.