Another use of using those APIs could be to detect browsers (when the UA is cloaked etc.) and ''discriminate'' based on that. [I haven't researched, is something like this happening already?]
'''You are using an unsupported browser. Please use X instead.'''
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[ 2.3 ms ] story [ 14.8 ms ] thread'''You are using an unsupported browser. Please use X instead.'''
[Unless it is a joke: obviously X = Chrome]