Thanks a lot for taking the time to provide that extensive and detailed answer. If your analysis is correct about the ColorSync warning (and I have no reason to believe it isn't), it's an example of how extremely poor writing can ruin a UI and waste customers' time. As it stands, the dialog appears to refer to some selection of ColorSync outside the printer's settings. "Printer color management" is, according to the Photoshop UI, the only other option besides "Photoshop manages color." Thus, I had already complied with what the dialog was telling me to do. What the dialog should say is, "The use of ColorSync within printer-driver settings is not recommended." If that's what it really means, anyway. And WTF, it should only say it once per print, at most! I didn't turn the dialog off, because I actually DO want to be notified if the color settings are non-optimal. But I'm going to have to turn it off. In regard to the greying-out: I pretty much arrived at the conclusion that you've provided. And I understand that vendor-provided driver UIs can be opaque. Heaven forbid that, 30 years in, an OS have a proper standard for this. By the way, the ColorSync warning will occur even with black-&-white printers whose drivers don't offer ColorSync at all. So really, you just have to turn this dumb dialog off.
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