Yeah, but I dont have any other way to mix. And I dont do it because it is a shortcut...I do it because it is the onyl way I can do it.
Also think about what ashcat said...physically headphones are more accurate because there is no interference between the sound source and your ears. There is no air or walls that sound can possibly cancel out frequencies or enhance some. The only actual interference would be the headphones frequency response.
And I also agree with what Nola said again. You pick Geoff Emerick for an example. Back in the day, the rule at Abbey Road was to place the kick drum mic at a certain distance, because the engineers thought that the mic could be damaged. But Geoff couldnt get the sounds in his head that way. He then began to place the kick mic inside the hole in the kick drum. Guess what...most of us do it like that now.
So point is...I believe that the role of a recording and mixing engineer is...get the sound he and the artist have in their heads. And you can do it in headphones, fuck modern standards, fuck if everyone is against you. Just goddamn do it. Especially if it is the only way you can do it.