I'm not a Boeing pilot, I fly the Embraer.
When the new GTF engines came along, Embraer were faced with the same problem as Boeing were- how to glue the new engines onto their existing design to get the efficiency benefits of the new engines?
So what did Embraer change when they made the E2?
Answer: Everything. New wing, new gear, moved the wing forward on the fuselage, new tail, new flight control system, new EFIS,I could go on but they basically rebuilt the aircraft from the ground up.
What did Boeing do?
New pylons, which didn't work very well. MCAS.
It's an interesting comparison, don't you think?