considerable checks and balances on executive power
Lol. The 'Muricans use to boast about theirs too. Not anymore, do they?
At the end of the day those are only words written in a piece of paper and can't do anything if the gang of thieves (politicians) with a gang of thugs (forces) decide to wipe their asses with it.
As I said, I'm not an expert in law, but for what I've seen when someone tells me their country (or maybe not theirs but one they have idealized) is different, it ends up not being true. Usually it's just luck they're wealthy enough and shit hasn't hit the fan yet.
You are very right. While non-copyleft licences makes sense for some software (a game engine like Godot, for example, released under the MIT licence) it's absolutely awful for the coreutils.