I agree that these are likely always barriers and would be more consistently tagged under the "barrier" key. Also I concur these are types of fences. While a specific tagging or subtagging seems desirable, I would not use the established fence_type for it, as this describes structural and or material properties, rather than the scope / purpose: https://taginfo.openstreetmap.org/keys/fence_type#values
maybe an additional qualifier like avalanche_protection=yes which could be added to fences, walls, galleries etc.? Cheers Martin
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