c.f. apt-get upgrade or similar, which takes a few seconds.
Except when the package isn't included, or it isn't the version you needed, because then you have to spend 40 minutes trying to install all the dependencies and building the package from source, instead of the 3 minutes it would have taken to install an .exe on Windows.
No, you take 2 minutes to install it using flatpak, or download a .appimage file.
And if neither of those are available, you spend that 40 minutes packaging the software, and submitting it to the distro you use for inclusion.
(If it was already packaged, but not new enough, that's a ~5 min job to do the update for your distro)
Ignoring feature enhancements and bug fixes for a moment, do you really think it improbable that there are security issues in a piece of software whose entire job is to sit on the network and record everything that it sees and then translate and interpret it?