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Developers use what they have at hand. Physics is a task that is simulated on CPUs, GPUs are rarely used to develop game physics engines anymore. Graphics power has increased much more than the computing power of CPUs, and this also influences what can advance more, in this case graphics, and what advances more slowly, physics.

More or less beautiful graphics have hardly any influence on physics engines, most of them use quite simplified models in terms of the geometry of the objects to be simulated.

What is really impressive and complicated is to get so many game-affecting systems acting at the same time, in a limited frame time, bug-free and with the power of a handheld console based on 2015 hardware.