I think it's coming from developers with proprietary backgrounds who want to normalize the running of untrusted proprietary software on the Linux desktop, probably from some appstore with abysmal quality standards like Android and iOS. Contrast this mentality with sticking to Free software you downloaded from the official Debian repos.. why do I need to be protected against that software? I don't. These mobile-like desktop protection schemes are designed to facilitate mobile-like software consumption habits. Fuck all of that!