I believe the advantage of doing it that way is it can more-easily integrate with wheelchair accessible seating.
In both the photos I posted, there are wheelchair platforms in front of the space. Also, the new building will also have wheelchair platforms in those areas.
Because the wheelchair platforms require a lot of space anyway, you can add those short staircases and provide access to the upper seats without needing more full-size access portals, which take up even more space and annoy just as many (if not more) people when someone walks in front of them.
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