Gregory's ServerAh okay! I don't think you will ever get the ability to delete things from the system partition, because (1) that is always read-only (only modified by the boot loader and that is important), (2) it would mean factory reset couldn't return you to the original state, and (3) even if you did, you couldn't use the space because it would only free that space in the system partition, not data partition.
OEMs are encouraged to use Play Auto Install instead.