In theory, yes. But if there aren't any tiers, the distinction between each grade would become smaller and smaller, because they have to accomodate more grades within the same number of marks. It will probably become more difficult to achieve the higher grades.
AQA B History is untiered, that's a rare one that does seem to work. But the grade boundaries are always difficult to set, as a couple of others have said. Certainly scientific subjects, there's such a difference between an F and a B candidate that sitting the same paper would be pointless, in my opinion. But yes, getting A-grade coursework and having to sit a Foundation paper must be annoying; but then again so is life...
Don't you guys get to choose? In my school only the really bad students get put into the foundation tier. It's fair because <D grade students won't be able to answer the A*/A questions as well. Therefore they would risk getting a lower grade than D easily.
Well, AQA ICT is 60% of the marks. Some of my friends got pretty good coursework, but because they're poor at exams, they've had to settle for a C, which could have otherwise been atleast a B.
It seems pretty fair to me. As others have said, when there are 8 different grades, it's impossible to have a single paper that caters for both A* students and G students. Also, you're put into whichever tier is most appropriate for your abilities; you'll only be entered for Foundation if your teachers don't believe you're capable of a B.
My take on it is, always do higher paper. No matter how bad you think you do, do the higher paper.