If you read the linked issue you will see that the plan for legacy printers is to move the printer drivers under a separate application that CUPS can then talk IPP to.
So yes, CUPS itself will only support IPP without any printer-specific driver. Since mobile phones also only directly support IPP this sounds like a reasonable decision.
> If you read the linked issue you will see that the plan for legacy printers is to move the printer drivers under a separate application that CUPS can then talk IPP to.
Ah, yes. Thanks for pointing that out! I wonder how much more secure that will make things for those who have to use legacy printers.
> Since mobile phones also only directly support IPP
Technically AirPrint is not IPP Everywhere, they use a different raster format and some different glue. For example my Brother printer supports AirPrint but fails ~50% of the IPP Everywhere self-certification tests. But that’s splitting hairs.
So yes, CUPS itself will only support IPP without any printer-specific driver. Since mobile phones also only directly support IPP this sounds like a reasonable decision.