When I tried Solus 3.9999 in late 2018, all of the software I needed at that time was available in the distribution's default repositories. Now, having installed the recently released Solus 4.1 Fortitude Plasma Edison, one important program for me, Kile, built using KDE technologies, is not available in the distribution, and the developers refuse to package it. It is available in other distributions and I have been using it regularly recently in Arch, openSUSE …