I think there is a problem with outdoor tribunes/ seating steps correct
tagging.
- leisure=stadium tag is for whole complex, not only for stadium (it
includes side pitches, parking etc.)
- building=stadium tag is for stadium as a building (in OSM we assume
that building is a construction, where we can enter "inside" it)
- building=grandstand tag is for tribunes, but there is assumption, that
it's kind of a building (as building=* these areas are rendered like any
other building, which is suggesting, that there is classic building or
roof in this place)
Looking at tribunes/ seating steps in amphitheatres or parks etc., they
absolutely aren't a buildings. Examples:
https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Amfiteatr_-_Przemyśl1.jpg/800px-Amfiteatr_-_Przemyśl1.jpg
http://www.nagawki.pl/gallery/Amfiteatr.jpg
https://d-nm.ppstatic.pl/kadr/k/r/fd/dd/57bf29eda3e82_o,size,933x0,q,70,h,a2d028.jpg
I think we need separate tag for them.
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