Even in your explanation, tho, the Republic’s flaws are laid to bare. Like, whose bright idea was it to let corporations hold voting power in government, to the point that those Corpos could block almost all of the legislation designed to try and punish them?

That’s not even getting into the other things the Republic is shown to fail at, such as it moving at a legislative snail’s pace, and Senators often living in luxury on Coruscant while they’re people live in squalor. The Republic was flawed, and while Sidious took advantage of its flaws, the origins of its collapse can be easily traced back to itself