History has shown that distro maintainers aren't perfect at patching security vulnerabilities either and that sandboxing is useful regardless. It also shows that user want working software and will go through the effort of inventing new package formats like flatpak to work around distro maintainers. Maintainers now have a choice between complaining that everyone else is doing it wrong and eventually becoming irrelevant, or getting with the program and maybe even offering their expertise to accomplish what people want to do