Stall speed is a big one.
When filling out the CASA response, you must include that you want them to increase the stall speed to greater than 45 knots, otherwise there will be potentially very few aircraft that are actually able to come across.
The best example of this would be a J230 Jabiru stalls at 45 knots at 600kg’s, so whilst it is capable of 760kg’s MTOW, it won’t be able to utilize it, because the stall speed will be closer to 49 knots dirty.