That’s basically what airbus did to create the A320neo series; add in larger engines (including the same one the MAX8 uses, actually), and make a few minor twea

That’s basically what airbus did to create the A320neo series; add in larger engines (including the same one the MAX8 uses, actually), and make a few minor tweaks to improve weight or aerodynamic efficiency. Done correctly it’s a brilliant move; 15-20% fuel savings without the need to significantly change pilot or maintenance (sans engines) protocols. Sadly the MAX8 was not done correctly.