I'm convinced the qwerty keyboard layout and the internet will eventually make "on" and "in" interchangeable or completely supplanting one.
It's already not a huge difference in meaning or pronounciation and people constantly typo it.
Just wondering how you pronounce "on" and "in".
And to add a fun little language fact, Chinese has a single preposition 在 (zài), that can mean "at, in" or "on".
Mastodon Community of Denmark (MCD) for Danes and other people to talk about Denmark or whatever.