You are right and I fully agree with you.
See all messages I have posted on this subject:
https://community.windy.com/search?term=North up default &in=titlesposts&matchWords=all&by=idefix37&sortBy=relevance&sortDirection=desc&showAs=posts&page=1
I am quite sure that changing the default setting to North up in the mobile app should not be a real issue. This had been done in the browser version and I don’t remember that anyone complained about it.