Going through the list of deletion requests, reverted by Mateusz Konieczny today https://wiki.openstreetmap.org/w/index.php?limit=50&title=Special%3AContributions&contribs=user&target=Mateusz+Konieczny&namespace=&tagfilter=&start=2019-02-01&end=2019-02-01, I request deletion in the following cases as well (pretty sure, I did not request it in the first place, because I just received 1 notification):
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https://wiki.openstreetmap.org/wiki/Proposed_features/employment_agency (same as number 1. proposed case, no history to keep: page contained information about the existence of the tag before the proposal already, nothing actually proposed)
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https://wiki.openstreetmap.org/wiki/Proposed_features/Tag:natural%3Dflower (author requested deletion of their own proposal, no occurrence in the database, apparently violates “Do not map temporary features”)
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https://wiki.openstreetmap.org/wiki/Proposed_features/Tag:natural%3Dfungus (similar case as above, original author and ‘deleter’ distinct)
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https://wiki.openstreetmap.org/w/index.php?title=Proposed_features/arena&oldid=436387 (original author figured out that other tags existed already and cancelled the proposal)
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https://wiki.openstreetmap.org/w/index.php?title=Proposed_features/castle&oldid=1325615 (cancelled proposal, 2010, expanding the scope of historic=castle to apply it to areas as well as nodes (in use on nodes previously already), archived on a user page, 2 deletion requests by different users reverted by different users already)
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https://wiki.openstreetmap.org/wiki/Proposed_features/Bag_shop (unifying different spelling variants, proposed new tag already became common before voting already, so no voting took place, few additional information on the page and its history (how proposed, alternatives, definition of a bag shop)
I would not suggest deletion in the following cases:
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https://wiki.openstreetmap.org/wiki/Proposed_features/Attribution (depreciated, but pretty common)
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https://wiki.openstreetmap.org/wiki/Proposed_features/shop:adult (different tag eventually used, still in database, deletion does not seem wrong to me but I would not do it)
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https://wiki.openstreetmap.org/wiki/Proposed_features/Adult_services (contains detailed discussions about tagging, same tag as above)
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https://wiki.openstreetmap.org/wiki/Proposed_features/Armory (a user wanted to delete it after copying it over to their user page)
https://wiki.openstreetmap.org/wiki/Proposed_features/Abandoned_highways (tag depreciated by life cycle tagging, but still in use and possibly an inspiration for life cycle tagging) -
https://wiki.openstreetmap.org/wiki/Proposed_features/4th_Dimension/Archive (extensive proposal, long discussions, different proposals can be used to compare ideas about historic mapping)
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https://wiki.openstreetmap.org/wiki/Proposed_features/age_group (two people set this up, but then did not continued, idea might be worth keeping…)
I will not continue with the following seven proposals, but I guess you get the point…