[CH] Is there any reason left why "is_in" is still regularly used in Switzerland?

I often map across borders (also in Liechtenstein) and nowhere else do I see such a large use of “is_in” as here in eastern Switzerland.
Is there still a relevant reason to keep this here although the wiki advises against it if boundary relations are already present?
Many of the values never seem to have had very much use anyway, since it’s just an “is_in=CH” or “is_in=Switzerland,Europe”.
All the information I checked was initially entered in 2010 and is probably obsolete by now.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/ch-is-there-any-reason-left-why-is-in-is-still-regularly-used-in-switzerland/7706