Android Multiple Users

Have you ever think that samsung is unfair for not adding in Android Multiple users feature which makes a completely separate system for another user if you lend your phone to someone else? It would have been easy if they slap it in to one ui 3.5. its been a long time feature since android nougat and they still refuse to give it to us till now. It would have been a great advancement to privacy for everyone. I always get trolled by my friend whenever he borrows my phone and it makes me sick. if they plopped multiple user maybe i saved a hundred pictures that was deleted without my permission.