Any usefulness of Fahrenheit is purely accidental, how is water freezing at 32F useful? I’ll grant that the finer resolution can be seen as a positive, I don’t see how Fahrenheit is better for human comfort, my personal optimal comfort zone is 22-24C°, and I have no need for decimals for that. 73F is pretty close to 23C, I don’t see much difference regarding comfort in either.
The huge problem with Fahrenheit, is that it is impractical in many situations, it has basically no merit to justify its existence, and only a minority of countries continue to use it.
Of course Americans can do whatever they want, but they are looking stupider for each year they keep using “Freedom Units”.
Of course Americans switch to metric for mostly anything scientific, for example NASA use Metric.