This feature is at about the right spot for me. It is still convenient enough for me to run software I want that isn't signed, but sufficiently obtuse that neither of my parents have figured it out. Given they are both prone to running any executable that any website tells them to download and run, this feature has probably save me several dozen hours of fixing their computers.
My answer to that was chromebooks.
Personally I'd prefer family to be on iOS than MacOS, there's even less rope to hang yourself with there.