I guess you don’t live anywhere where it snows then. Knowing whether water freezes at sea level is very impactful since a majority of people on the planet live pretty close to sea level, knowing when my blood freezes seems really useless.

Also no one uses decimals with C° unless it’s a medical situation or similar. There’s so many factors that you can’t tell the difference between 17° and 18° anyway, regardless of F° or C°