(for instance, the first finding speaks of the initial 28 day declaration being within the authority of the governor)
https://courts.michigan.gov/Courts/MichiganSupremeCourt/Cler...
I'm being pedantic, but you are implying a narrative that doesn't exist.
Specifically, it found that that emergency powers act under which she acted was an unconstitutional delegation of legislative authority; the fundamental error the Court found was by the legislature, in not crafting an emergency powers law with sufficiently defined boundaries (or, alternatively, by not availing itself of the process to amend the Constitution to create broad emergency powers.)
On the other hand, you can go next door to Ohio and find a ruling using that language in Rock House Fitness et al v. Amy Acton and Lake County General Health District. I decline to enumerate further suits at this time; I need to stop somewhere or I'll be here all day and it won't do anyone any good.
However, there are plenty of direct erosions of democracy, even here in the United States. Our democracy in the US is applied through the rule of law, and many mandates have been issued in a manner inconsistent with the law: arbitrary, capricious use of power not authorized by the law. This is why, for instance, a court struck down Michigan governor Gretchen Whitmer's extended use of emergency powers.