There's a grey area here. Celsius is much more nearly metric than Fahrenheit. Most of the time in the engineering world when you're using temperature in calculations it's temperature differences that are important, and for that Celsius is just fine while Fahrenheit is a pain in ... well you first convert to Celsius. Doing thermal calculations entirely in the US customary system is trickier and generally not even taught. A friend was recently going to a vacation home and asked me for help working out the problem of how many gallons of water could be heated by a battery-powered generator operating a water heater. Do you start by converting gallons and Fahrenheit into kg and Celcius, or do you work the other direction and convert Volt-Amperes into Btu/h? That's a rhetorical question.
If you're working in a more academic field than you'll use whatever temperature units are convenient for your purposes. You can't say "... Rankine is better than ..." without being very specific about the area of study.
Similar arguments apply to other kinds of units when thinking about the US "going metric." There isn't only one way to do it, and it doesn't have to be an all-in or all-at-once thing. Considering all of the machine shops and the like, a realistic transition will take decades before we get mostly there. It starts with little things like posting speed limits in Kph (as well as Mph) and selling milk in liters (gallons also labeled). For most units like distance and mass/weight, metric is no more or less "natural" than the US customary system. You do have a merited argument with Fahrenheit vs Celsius, but it's a weak one and lots of folks have become accustomed to C.
If we were ever to make this transition, it might help a tiny bit to de-mystify science. Even just to internalize concepts like force (weight) versus mass. You can't convert pounds to kilograms without assuming some value of g. Pounds convert directly to Newtons, and kilograms convert to slugs.
But on the other hand, if we ever started making metric screw sizes, as one example, then a lot more globalization may start to kick in which is not necessarily a good thing. Maybe it would be, but it's hard to predict accurately. We historically lose manufacturing jobs. Is it advantageous for us to be out of sync with the rest of civilization?