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                        Antiquated UA
The current User Agents may do the job but I imagine that for example the firefox UA running on Windows NT may raise a few eyebrows. Perhaps updating the User Agents could be an idea.
I agree that the UAs should be updated.
One clarification though: "Windows NT" is a class of operating systems, and all personal computer versions since 2000 fall among that. The Firefox UA specifies "Windows NT 6.1", which is Windows 7 or Windows Server 2008 or Windows Home Server 2011. There are definitely still a lot of users with Windows 7 (over a third of all Windows machines as of a few months ago according to Wikipedia). What would raise eyebrows is the Firefox version from 2015 though.
Partially fixed by #364, #365, #366, and #376, but there are still some outdated UAs in there.