If you think about it, once you reform your religion then you get 80% of the tech level of the bordering European nation regardless of what tech level you had before. I think this new development system may actually help the native American nations since you can just dump the first 60-80 years worth of power points into development while ignoring administrative tech level as long as youre willing to wait a few decades on exploration. Just be sure to have enough diplo pints saved up to get several exploration ideas instantly as soon as you reform your religion in 1520-1540ish range, as the religion reform should open up first 2 idea slots.
EDIT: Especially the Incans.... Imagine having six gold producing provinces with 10 BT. You'll be filthy rich as soon as you westernize