The "high precision" is required for the very basic use case of printing a page of black on white text that does not look horrible, and being able to reliably p

The "high precision" is required for the very basic use case of printing a page of black on white text that does not look horrible, and being able to reliably print a 30 page document without jamming. Making the paper feed and printing head positioning hardware to do that is 90% of the way of the expense of building a decent printer.