Unable to answer "Does this bench have any armrest?" – Bench – https://osm.org/node/7860161589 via StreetComplete_ee 63.0:

Platzumbau

Attached photo(s):
https://streetcomplete.app/p/334994.jpg
https://streetcomplete.app/p/334995.jpg
https://streetcomplete.app/p/334996.jpg
https://streetcomplete.app/p/334997.jpg