"nice" command denied in terminal even as root user

Hello,
I am trying to run the "nice" command in terminal as an admin (me):
nice -n -19 /Users/Michael/Desktop/Minecraft.app
It failed with this error:
nice: /Users/Michael/Desktop/Minecraft.app: Permission denied
So I logged in a the root user and tried again and it still had the same error.
I have 2 main questions:
1, Why couldn't I run this command as a root user?
2. As an admin, shouldn't I have been able to run the command without logging in as the root user?

I hope it's ok if I bump.
bump

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"nice" command denied in terminal even as root user

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