Boeing was doing what the airlines wanted, which is provide a new more efficient airplane that requires minimal training for existing 737 pilots to fly, much like the A320neo. Airlines are the ones who schedule the pilots and their training, and from what we have heard, there _is_ training for pilots new to the Max that apparently some airlines have not administered.

Ultimately Boeing and the airlines share responsibility for ensuring the training is adequate, thats why many airlines have lots of training that goes above and beyond what Boeing supplies.