Depends where you look. Great British Chefs is great for sous vide... all Celcius. Of course American sites will be Fahrenheit to pander to their biggest audience. Fahrenheit seems retarded for cooking/Celsius seems better, given the starting point of cooking... basically 0C, arguably, with benchmarks like 100C being cornerstones... which in Fahrenheit are 32 and 212 respectively.
It is all arbitrary.
The point is...
I google....
First link gives me in Fahrenheit.
I put it in.
That's 3 steps.
Or
Goddammit, /goes to convert.
Load up app, or talk to Alexa.
That is 4 steps
Or click back, scroll until I find one in C.
That could be 5 to 7 steps, depending how many sites I have to click and then click back.
Or, I could leave it in f as so far, in my experience they all seems to be American based sites and I need not to convert at all. Besides, the number make sense for water between freezing and boiling point but the Anova does not hit 100c at all....I tried. The point is it saves me converting, it is just following the guides, saving time in searching for a site in c or having to convert it.
Granted, I convert it by actually saying it out to Alexa and it tells me.