I agree, much to do about nothing. As Peter points out, Printer Manages Color is using a profile or let's just say some method of converting to the native color space the driver needs. Not all profiles or conversion methods are created equally too. Personally I'd prefer to use good profiles and soft proof then decide on a rendering intent per image. Using other methods, like sending sRGB to the printer doesn't mean the print is going to be poor by any stretch of the imagination. And if you show just one method (Printer Manages Color), you've got good data, most people will say 'great print'. Unless you show them both processes, it's impossible to say which appears better so it's kind of a silly excuse to do this and suggest people not to use ICC profiles. If he even said that.