I do agree about the date formats but Fahrenheit makes a lot of sense for day to day casual use. Below 0 is pretty fricking cold and above 100 is pretty fricking hot and the degree increments are about twice as granular. For a lot of scientific computations an absolute scale like Kelvin would make more sense but that wold obviously be ludicrous for day to day use. Celsius as an absolute scale actually seems inferior to me and, as another commenter noted, people in the US doing engineering etc. are perfectly comfortable with using SI units as appropriate.

The rest of the world has no idea what fahrenheit is and is not about to learn

My parents were taught it in the 40s/50s but not longer use is either

Really? Almost nobody uses reasonable date formats. YYYY-MM-DD is the only reasonable format, but afaik, US and EU both tend to put month and day first, day/month/year is consistent, but still unreasonable.

Europe uses dd/mm/yyyy, Japan uses yyyy/mm/dd only the US uses mm/dd/yyyy

At work I tend to write dates yyyy/mm/dd so it’s clear to my US coworkers what the actually date is