I know that, but that does not give apps root access. Unless you mean something else by root access than being run with root privileges

But Shift+insert currently pastes the primary selection, not the copy-paste clipboard. So it doesn’t do the same as Ctrl+V.

Well, the article proposes to use dedicated copy and paste keys. If you don’t have an insert key, you probably don’t have those either.

And best of all, you get an OS that is secure, which traditional Linux distros aren’t due to every app having root access by default.

What? Which distro runs everything as root by default?