I already said it's not about common sense, it's about legal risk.

It's about edge cases like someone set up your email to forward all your emails to their account without you knowing. Or other additional situations you could imagine.

There is no benefit to not emailing grades directly, from the perspective of Instructure. There is no ulterior motive here. But universities are genuinely risk-averse and their lawyers tell them that not including the grade in the email simply shuts down one more avenue for some potential lawsuit. Which costs money to defend even if a university wins it.

This isn't some kind of "dodge". This is literally just Instructure doing what university lawyers demand.

I agree with you that the email address is generally always also controlled by the school and has the same login authentication. It doesn't matter. I told you this isn't about common sense. This is about lawyers saying that it could reduce legal risk. And that is a true thing that is coming from real lawyers. Even if you disagree with those lawyers.

And Instructure isn't going to try to disagree with lawyers for its own potential customers. It's going to give the schools what they want, which is not revealing grades via email.

It's not a "dodge."