As I understand it, the firmware for the majority of MicroSD cards is very limited. The physical size and low price point are likely the reason you don't see these more complex features in consumer cards. Also, if I recall, there's nothing in the spec about levelling so you'd probably get some half-arsed buggy implementation anyway.
Thank you for the clarification!
MicroSD cards tend to have much worse durability and IOPS than common USB sticks, and especially, say, an M.2 SSD to USB adapter.