In my humble opinion, the key to appreciating the advantage of dark matter over modified gravity (of any kind) is that there is at least one galaxy that has bee

In my humble opinion, the key to appreciating the advantage of dark matter over modified gravity (of any kind) is that there is at least one galaxy that has been observed to be consistent with no dark matter. That’s only possible if unexpected gravitational effects are due to dark matter, and that it be absent... it’s pretty difficult to think of a situation where modified gravity would re-modify itself to behave exactly as we expect it to.