Bonjour Cade !
I understand your point, and indeed these pronouns could be used to express general statements.The reason we're asking for "on" in particular is more to do with the technical limits of our system, in order to limit the number of correct answers which could easily become "endless" :)That's why we use hints to restrain the range of the exercises.
The pronoun "on" is very ubiquitous in spoken French, both to express "we" and general statements. I tend to write the challenges as I speak, and "on" comes very naturally to me when it comes to general statements :)
I will however keep in mind to try and use "vous" in general context as well in the future, to offer variety of uses.
I hope that's helpful!Bonne journée !
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