Absence of folder lock facility in iPhone cripples user experience!

I find it strange that App Store apps or iPhone settings do not provide you an option to individually lock an app, for example, messages or email or photos. What iPhone has is a central phone lock, once that is unlocked, most data is open for everyone to access. There is a guided access in settings, which, in my opinion, is counterproductive or lacking in any insight.

I contacted Apple at least 2 years ago and requested this facility and I haven't heard from them since then.

This is embarrassing when Android let's you lock whichever individual app or folder you like with a myriad of apps available in play store.

In my opinion, the option to individually lock apps and folders even when the phone is unlocked, is essential for iPhone users. This is all the more important to those mums and dads who occasionally let their children use the phone. Can Apple do something about this?

Anyone else here has any insight as to how to protect individual folders and apps? please share your thoughts.

Regards,

James