Yeah, unfortunate to rain in the parade but GNU/Linux definitely needs some attention sooner rather than later. Plenty of design benefits, but also plenty of pitfalls from an OS sec POV.
Average users aren't installing SELinux or Qubes so I hope no-one was actually going to reply with what Linux can do as opposed to the everyday user experience.
A few years outdated, but relevant: https://madaidans-insecurities.github.io/linux.html