Yeah, that is a drag. Sometimes you have everything lined up and just want a slight change in one direction. This is where view cameras shine over tilt/shift lenses. Also, Canon has the best, most flexible ones, but still.. if I have a diagonal shift on (shift + rise) I can't get a perfectly horizontal swing. Truly independent movements are key.
And then there's the opposite end of the spectrum... A7r with Canon 17-40 zoom. No movements at all, heh. From a couple weeks ago in New York.