You're going to need to learn that many of us separate the term "self challenge" and "optional".
I don't separate them, either. But there's no need to here. Dowsing was not a forced function. If it was, then the complaints about it would be legit. But it wasn't, so they're not.
agreed. The problem I had with it is just that they never really implied that it was optional and that fi was always beeping.