It’s possible you’re curious.
Greg Travis breaks it all down in this long Medium post that’s super worth your time.
The tl;dr here is that Boeing was doing everything in their power to make fundamental changes to the 737 without the result being considered a new airplane, and they went WAY THE FUCK TOO FAR. Moreover, the software at work to make the new plane fly like the old plan (& thus prevent legions of pilots from needing recertification on the MAX) made some seriously, seriously stupid assumptions.
One wonders if this plane will fly again at all, but if it does I suspect it’ll be as a creature distinct from the 737 parent.