7. Now click the Add button. This selects the vendor's printer-specific driver software (that you presumably previously downloaded and installed).
Finally, open the Print dialog for a document. The vendor-specific options should at last appear. In my case, the previously missing Color Options did finally show up as expected.
In case you're wondering, the vendor-specific Epson driver still allows printing over Wi-Fi. AirPrint is really only relevant for iOS devices. And my iOS devices worked with the printer, via AirPrint, regardless of the printer driver employed by my Mac. All was now well.
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