Why can't I lock a folder?

Really Apple? How am I suppose to keep my 3-year-old in the right folder?

And please, save me the "Well, we do have the Guided Access feature bla bla bla.". I know about it, and it's only slightly less worthless than NOT having the feature.

Now, if you had guided access for an ENTIRE folder, we'd be onto something.

With the ability to lock an ipad to an entire folder, versus just one game, my toddlers could storm from one game to the next, within the folder, to their heart's content.

With respect Apple...have between 8 and 147 Apple devices strewn around the house, so I'm generally a fan...not having something like this is pretty laughable frankly. I've seen threads from YEARS ago asking about this, and still nothing. 3rd-party apps will let us save pics, music, etc into a "secret folder", but won't let me save actual apps.

Anyway, feel free to fix this ANYTIME!!