The reason is pretty much just laziness. This is actually my work laptop. I told management that I needed Linux. They only know about Ubuntu and their “monitoring” tools have only been tested on that platform. Thus I couldn’t use any other random distro.
I’m also a Firefox supporter (I use Chromium as backup since some company resources work better on that). I found out that the Firefox-ESR was still released as a deb and the installation is without a hassle. I just need stability and no the latest bells and whistles.