Boeing cut cost by patching big engines on an old airframe design, requiring MCAS to be certified. Boeing crippled (let me know if you find a better word) MCAS to limit training / certification costs. There's only so much you can do to cut costs before bad things happen, and it looks like they still don't get it by not going back to the drawing board and think that "fixing" MCAS is enough. At the very least, they redesign MCAS properly with all the necessary training, and if it means a new type rating, so be it. Time will tell !