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This was back when transport jets had turbojet engines rather than turbofan engines. The former is much smaller in diameter. The 737 was originally designed to be low to the ground to more easily embark and disembark people and cargo at airports that didn't have jetways and scissor lifts. If you look at previous 737s, the engines are flat on the bottom to allow for clearance with modern turbofan engines. At some point when you start expanding the airframe the larger engines required are going to need a different mounting strategy. Regardless of where or how you mount the engines, you are going to create issues with flight control in various stages of flight.

It's important to remember that Airbus and Boeing have or at least had very different strategies for aircraft design. Airbus started using fly-by-wire technologies with the A320 and uses software to address pretty much all problems created by aerodynamic designs. Boeing uses a more traditional control cable to hydraulic actuator design at least for most of their aircraft prior to the 777. There's advantages and disadvantages to either approach.