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.
As someone whose elderly parents run Windows and have never run 'any executable that any website tells them to download', and I myself have not seen a website that gives me a random executable in over a decade: Out of curiosity, how often do your parents encounter the dialog in the article?
It's shocking, it's worse than Windows (sad fact: Mac has more malware/adware than Windows since the last 3 years).
Of course you can't see that if you're not on Mac or if you have an adblocker. Ads detect the browser and specifically target Safari. Safari removed support for extensions last year, dropping all adblockers, it's wide open to targeting.