I'm still learning this stuff and I consulted my personal music theory 3-ring binder (a collection of material I try to keep organized).
Is this table always true?
Gee, I hope so, or 60+ years of writing music is out the window for me.
I’ve tried to envision how calling Am 6 1 3 in the key of C could possibly be useful, and I just can’t come up with anything. I think I can come up with reasons it would be counter productive. But if someone out here gives a good reason to do this, then as Mario said, it would have to be an option, and not the default setting.