What are your thoughts on the use of arbitrary (non-polyembryonic) indian-type mango seedlings as rootstocks? I usually plant the seeds when I eat "store mangoes" (with the intent of growing some rootstocks), and have some getting nearly up to grafting size, but I've second guessed myself, wondering whether I should only be using rootstocks from a named cultivar. But on the other hand, most rootstocks from named cultivars are usually optimized for particular environments, and no particular environment is likely to match *my* particular growth environment; surely there's some merit to the argument of, "plant it, and if it grows well, it's probably a good rootstock".
What are your thoughts? Are only seedlings from named cultivars suitable, or are arbitrary monoembryonic seedlings good so long as they grow well?