For the its less than 1% maybe. For the the reason of there is to many distributions for us to support. Thats utter BS, just support at least rhel or debian if not just MAKE A FLATPAK.
for context i got lightburn running on my t440p with libreboot runing gentoo linux. I installed lightburn through there appimage and it works great! Im fine if they wanna drop outlandishly niece distros like triquel or hanna montana linux. But why linux as a whole!