That problem of modern complications and a kludge of "modules" or "units" as remedies is the central problem of the 737 MAX. Why? Because Southwest and a few other customers wanted the 737 pushed, beaten, hacked, and morphed into a 757 but retain the 737 model /type certification.
Alright, you have it. How's that working out? Any regrets for not listening to advocates for continuing the 757 or starting a mini 787 type?