A bit related, but I hate how many errors I get because I want my system language to be English instead of my native language (Norwegian) on my laptop, phone etc. Because I don't want a badly translated experience. However, I still want units in meters, Celsius, dates written sensibly, time in 24h format etc. But not all apps understand this, which is quite annoying. It's like they only look at the language and make…
I usually set my system to English / Ireland. I get English but with normal units and € as a default currency.
A fun trick is that if you install Windows 11 with the "English/Europe" locale, it doesn't install a lot of the bloatware because it's not defined for that location.