[Talk-GB] Is it useful to tag material=* of stiles?

[Mateusz Konieczny]

https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dstile#Stile_type claims

"Where possible, the stile should be tagged with material=* with values stone, wood, or metal."

But is it actually useful? Based on photos it seems that basically all stiles within
walls are mostly material=stone and ones with fences typically wooden,
with ladder stiles made of wood.

Is it useful to tag it to catch unique cases?

Also, what should be tagged if stile is made both out of wood and stone?
Dominant material? Neither? stone;wood?

See
https://commons.wikimedia.org/wiki/File:Drystone_Wall_(26721799888).png
https://www.geograph.org.uk/photo/398328


Asking as I am considering implementing StreetComplete quest but
I am not sure is it worth asking.
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