There are two problems with MOND. One is that it exchanges fine arbitrary parameters of dark matter with the arbitrary parameters of MOND. There isn’t a theory

There are two problems with MOND. One is that it exchanges fine arbitrary parameters of dark matter with the arbitrary parameters of MOND. There isn’t a theory the explains MOND or the parameters. It is just as much of bodge as dark matter. Second is that MOND doesn’t explain all the observations. There are galaxies that have too much or too little gravity. Either MOND varies exactly as we neeed it, or need MOND and dark matter. That isn’t any simpler. It might work if there was theory that explained smaller amount of dark matter and MOND could handle the rest.