Thx for the flowers, but I’m also only and advanced user 
With root, some advanced linux commands are ‘free’ for use by apps. For example: getting access to root / system folder with write access. So it’s simple to write an app which will manipulate your whole system, installing a keylogger or malware.
Sure, normally a app is asking for root access. But not hacking apps. They will install what the want without asking for root access.
If an app will need root access, all my alarm lights will go on. Sure, a backup app needs root access to read all partitions and folders for backup and restore. But why do a Video player need access to root ?? No, never will use such an app.
I don’t know what kind of apps with needed root your are using. But really, is here no alternative app without root access ?
Do you allow all your apps access to phone / location / address book / microfon … and so on ? No, you will restrict them.
So why allowing an app access to ALL folders/data on your phone ? But that was not your question.
One other question: Do you using Windows with the admin account ? No, always with a user account without admin rights.
Or on Linux, do you login as root ? No, always as user without root rights. How much programs do you have installed on Linux which needs running under ‘root’ account ? I think none.
So why working different on your phone ?