Ease of installation
Most applications offer multiple package formats for installation.
Being chat applications, Matrix clients often come as web services. An example of this is Cinny’s web page, which has a link to the online version of the application. You have to actively seek out the Flatpak edition. This is the same for Element, although installing it on your smartphone is actively encouraged. It doesn’t mean it’s impossible to install these on Linux, it’s merely a quirk of their web pages.