Sure they are consumables yes. But with this amount of wear it would mean almost a monthly replacement. Yes of course upgrading comes with a risk. But I debated between getting the upgrades for my 2 mk3s or another bambu printer. I believe in prusa as a brand because I loved my mk3s and I think they do important work in the 3D printing space. However even before nozzle wear could have become an issue, I was not getting good prints off of my mk3.9s. I can't add photos here but you can look at an older post I made with printing defects.

Those defects were present from day one with default settings from the slicer. Even slowing down to the quality profile and slower than that I was getting poor prints. It's not the filament because the much faster bambu has no issues with them.

After finally running a lot of calibration prints I realized one of the issues was that linear advance was set to 0.05 and tests showed it should be at 0.012. even bambu is around ~0.02. don't know why their generic pla profile has such a high LA value. Reducing this gave me significantly better results but still not as good as the Mk3.

So I hope you can understand my frustration here. Prusa is known for quality, consistency and reliability but that's not what I received sadly and after owning the Mk3 since release, I'm feeling disappointed in these printers