Who would they sell it to?

What I consider a “better interface” is almost certainly not what a new user would consider a “better interface.”

Those are libraries used by user space applications. Most distros won’t boot without them, but you can still get into a recovery shell.

Hard disagree. Prusas used to be completely open source. Now they merely have open source components. It isn’t accurate to call them open source.

Would you call Windows or MacOS open source? Both Microsoft and Apple have made parts of their OS’s open source, but that doesn’t mean the entire product is open source.

Besides the others that were mentioned, Prusa is moving away from open source.

https://hackaday.com/2024/11/20/with-core-one-prusas-open-source-hardware-dream-quietly-dies/

A dryer costs about as much as 2 rolls of cheap filament, and if you don’t print very often then you’ll probably waste more than 2 rolls to failed prints. A dry box with desiccant can also work, but it doesn’t remove moisture efficiently - it just keeps things dry, so it won’t recover your wet filament.

On the other hand, if the trick with the heated print bed is working for you, that’s probably good enough. A cheap kitchen scale will tell you if it’s removing moisture.