In this case I suggests closed:shop=yes. This tag will not be renderered, but entiti will be available in editors.

I think that geometry is different issue, but as possible solution, fixme=square may be added.

But "vacant shop" is "closed shop" also. "Suspended" would be more clear, if this difference ("rented or not rented") is important (for me personally, it isn't).

No known semantical difference between "closed" or "vacant" in context of shops. I can suggest suspended:shop=yes or shop=suspended (ATYL).

Hi, os-emmer!
Presumably fits, as I will understand from name.
Regards,
Something B.

Hi, Mateusz!
Minor issue: address duplication:
node/10785944117
node/10206680730
Regards,
Something B.

Hi, Mateusz!
This page might be helpful:
osm.wiki/TIGER_to_OSM_Attribute_Map
Regards,
Something B.

Nothing strange, this is just how Potlatch worked in live mode.

Hi, Mateusz!
I decided to keep the outline for the sake of saving the address, but if You removed it, no problem.
Regards,
Something B.

OK, no problem!
Regards,
Something B.

Hi, Marc!
14 hot springs (?) from maps.me user. Maybe fakes.
changeset/135516632
Regards,
Something B.

I forgot to close the changeset after the editing of the Philippines. Happens.
Regards,
Something B.

Hi, Mafedisz!
This shelter and hostel are real?
Regards,
Something B.
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Published using OSMCha: https://osmcha.org/changesets/135430184

Hi, Indydac!
Please write phone numbers in international format (with +).
Regards,
Something B.
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Published using OSMCha: https://osmcha.org/changesets/135430371

"Сусанна" in Buenos Aires?
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Published using OSMCha: https://osmcha.org/changesets/135405317

Hi, Fezz76!
Phone numbers should be in international format.
Regards,
Something B.

This changeset has been buggy revert attempt. Reverted.

Please don't add fake features to osm.
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#REVIEWED_BAD #OSMCHA
Published using OSMCha: https://osmcha.org/changesets/134838877

I can return it as it was, if You insist.

Hi, mueschel!
According to osm.wiki/NaPTAN/Tag_mappings, naptan:NatpanCode=* is equivalent to ref=*. I think that generic tags (ref)=* are preferred over project specific ones (naptan:NatpanCode). Although there is no equivalent for naptan:AtcoCode=*, ref:*=* tags are commonly used for reference numbers or codes.
Regards, Something B.