I have no issues understanding what 20 °C or 30 °C outside means.

Of course you don't, I'm not saying Celsius is incomprehensible.

100 °F is hot when I go outside, it’s cold when I need to cook, which is also an „everyday activity“.

I'm not arguing Fahrenheit is better for that, use Celsius.

It doesn’t make „more sense“, every point of reference is arbitrary,

I disagree, reference points are extremely important. That's one of the reasons Celsius is so useful. Maybe its a weird example but one thing I use it for is brewing temperatures for coffee. I know the closer it is to 100, the closer it is to boiling. That's very useful information to me. I could do the same thing with Fahrenheit but the number is so weird that I don't even remember what it is.

It also affects how small the units are which is pretty important. Farenheit has smaller units, so it can be more precise without having to use decimals. If I tell someone what temperature it is outside, I will be more exact than you most of the time.

Fahrenheit is not „more intuitive“, you’re just used to it.

Me just being used to it isn't a good argument. I barely remember many aspects of the imperial system because I've replaced it with metric. The aspects of imperial I still use were chosen intentionally.

I could also say that you're "just used to it". I could say the reason you're so resistant to any advantages of imperial is just because you learned how to do things with metric even when it wasn't optimal. The reason I'm not saying that, is because I'm giving you the benefit of the doubt and assuming you are here to have a real conversation. Do me the same favor.