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This might've been a side effect of removing support for third-party kernel extensions rather than something changing with the printer system specifically.

I have an old (~10 years old) printer that Cannon stopped supplying updated macOS drivers for several years ago. The installer for the drivers failed so I had to extract the files from the package and install them manually. In the end only the network drivers work, the USB drivers are kexts which won't run.

Oh man! I came here to complain about printing! I just discovered yesterday that you can no longer drag and drop print jobs from one printer to another. Apparently you can move a print job via some command line stuff but it just ended up deleting the jobs entirely. The only reasons I found this out is because the printer which had been working fine moments before just stopped working after replacing toner. No amount of deleting and re-padding the printer or power cycling either machine fixed it. One time the whole OS just froze and I had to force reboot. I spent a good chunk of the afternoon trying to get one 3 page document to print. To be fair, I haven’t had problems with this setup for 10+ years but when it went south it also went to the remote frigid corners of Antarctica.

They overhauled CUPS and replaced chunks of it.