I have done a fresh install of MX-21 KDE. There were some problems first since Noveau driver doesnt support new GPU's (Nvidia RTX 3060 Ti in my case) Installing the Nvidia driver after installing MX on the hard drive didnt work, computer couldnt boot due to some conflict with network driver as I understood it. I dont know why, but it was no problem installing the Nvidia driver in the persistent live ISO and
then install the ISO on the hard drive and the Nvidia driver was installed with it..
Now after running MX-21 a couple of weeks after configuring the installation the way I want, I can only conclude that the team has done an outstanding job again. Everything just works. Well done!
