[Tagging] Is shelter=separate wanted? What is the meaning of shelter=yes

[Mateusz Konieczny]

shelter=separate was recently added to page documenting shelter key

See https://wiki.openstreetmap.org/w/index.php?title=Key:shelter&diff=2012123&oldid=1990179

It effectively redefined shelter=yes from "this bus stop has shelter" to 
"this bus stop has shelter that is not separately mapped"

https://taginfo.openstreetmap.org/keys/shelter#values 
shelter=yes has 557 951 uses
shelter=separate has 245 uses

I want to explicitly describe shelter=yes as "it means that given object has shelter. It may
or may be not mapped as a separate amenity=shelter object"

And describe shelter=separate as unwanted value that should not be used
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