You can have macro evolution without new body plans or complex functional systems. Pretty much everybody would consider the difference between canines and felines go past the bounds of micro evolution, yet the body plans are not fundamentally different, and hyenas look like a blend. It is more the rule than the exception that macro evolution not involve a great deal of complex novelty when it comes to more recent branches.
If someone makes the argument that micro evolution cannot accumulate to macro evolution, it falls on them to offer a rigorous definition of micro vs macro, and why the limits of change are in effect. Otherwise, it becomes a rather arbitrary assertion.