I actually have no idea how much overhead it would entail. However I think I do have a valid point, and this is where CAS designers and pen & paper ideas clash. Actually more of a case where Maple needs to walk the talk. Not to butt heads, but perhaps output is exempt from this? In 2-d math you enter equations as you would on paper as Maple explicitly points out, I would also expect the output to be the same as on paper as well, or at least as close to possible as it can. If someone were to hand in a paper and the answer they wrote (on paper) was I am 100% sure the professor/teacher would mark it incomplete.
I'm not trying to butt heads, all I'm trying to say is that someone wouldn't write down a calculation like that on paper, and Maple touts being able to enter equations as you would on paper, I would also like to see that in the output.