I am sorry for all the people having problems, but my Prusa mjni is finally just workjng and happily printing all the stuff I throw at it. Its been having issues here and there forever. I just figured out that the hotend has not been assembled correctly (heatbreaker to nozzle seal was weak) which became a greater issue when switching to a 0.25mm nozzle. Now after I fixed it, it is just awesome :)
I print a lot and on different printers, mostly petg, some abs and tpu. All of them require some configuration unless you are extremely lucky or print with filament from the same brand as a printer. Bbl (including x1) isn’t better or worse in this regard in my experience.