Imo the best system would've been Celsius with double the precision, e.g. water freezing still at 0ºC but water boiling at 200ºC.
That way you have the "human livable" range kinda between 0-100, which feels very intuitive. Anything above 100ºC becomes effectively unlivable. It also means that it is much easier to distinguish between certain "zones". e.g. saying "70s" or "80s" is easier and more clear than with celsius where you typically are staying within a sliding 10º range from day-to-day.
That way you have the "human livable" range kinda between 0-100, which feels very intuitive. Anything above 100ºC becomes effectively unlivable. It also means that it is much easier to distinguish between certain "zones". e.g. saying "70s" or "80s" is easier and more clear than with celsius where you typically are staying within a sliding 10º range from day-to-day.