Flight control software incorporates a load alleviation function on newer aircraft. Sharklet equipped models have noticeably better performance than non sharklet ones, even with the same engines.
However I agree regarding the wing, the B737 MAX is a perfect example of a manufacturer pushing a design too far. Any further increase in size or weight and Airbus needs to look at the wings. This would be worthwhile as improvements in technology over the last 30 years would likely deliver considerable gains and be worthwhile incorporating.