This is what "Past Tense" was really warning us about.

Turns out it was just someone who didn’t know how to change the setting.

That's crap. Kelvin is the only true metric temperature measurement.

I think our whole timeline spans from some Romulan plot about something involving handing a compilation of Federation history to some weird guy... What was his name? Gene Roddenberry?

Star Trek really was overly optimistic.

Star Trek future now!

Hate to point this out, but the fact there is a "C" on the sign kinda shows that no America did not adopt the metric system. If the US did there would be no reason to have "F" or "C" by the degrees as they are the last hold out.

This is the most unrealistic thing about the episode.

Thank God! As a non United-stasian, I believe this will make things better. The imperial system looks broken as hell to me, if you see a chart comparing both, you will see what I mean.
/not joking, not in the mood of hearing sacarsm.