As announced a couple of weeks ago, power users always have an option to enable sideloading of unregistered APK files through an advanced flow that requires an authentication step to confirm they are taking this step of their own volition and a one-off, 24-hour waiting period to deter scammers.
Sure. That’s the reason why they’re introducing a 24-hour delay. Not because they want to make it miserable so people stop side loading.
The citation is in the OP and also the comment you just replied to. Literally the entire OP article is about the differences. You can’t possibly read it and not see them.