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Re the <2% figure for non-JS use, that’s in line with a whole lot of other data, including private testing I’ve done on a million+ member European site.
However, there’s a large blip in one particular user group: vision impaired people who use screenreaders. Repeated surveys have shown that somewhere between 10% and 25% of screenreader users have JS off. See the latest WebAIM survey, for instance.
I realise in this particular case (maps), there are a whole lot more hurdles in presenting useful info to the vision impaired than just JSlessness, but just sayin…