I would suggest looking up how OpenVMS works for example.

Why learn a Bullshit OS (fuchsia) when you can learn ~unix and cover 90% of usage.

Again Students are not stupid they can read and learn for themselves after learning the basics of a OS...what Xv6 is for.

But maybe you are that hidden genius professor from MIT that could teach everything much better. But then, why do we even talk, right?