I enjoyed the article cited within this one about Celeste’s (unspoken/explained) leeway with its controls and how they contribute to a good feeling platformer.
Yes it is rude or uncouth to bare your teeth in Russian culture but I think that sentiment is belongs to Russia alone; I could be wrong but I don’t think throughout the world there are countries where people refrain from smiling. There is a rhetorical ambiguity in saying “it’s cultural” rather than “it’s Russian cultural”.