Of course, it depends on what he wants to achieve. But there's quite a bit of seemingly simple functionality that you need transformation matrices for. For example, registering clicks on stuff that moves around (or any other thing that needs pixel checking).
Also, drawing is easy when you already know where and how you need to draw it. If you need to draw something in relation to how something else rotated, it's trickier. And it seems to me that OP is asking about the latter.
[HELP] ImagePoints
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