propellers are basically low rev devices, about 3000 rpm max.
So most piston aero engines are usually the same to avoid a reduction gearbox. So a slow revving device is required. Nevertheless the standard light aircraft piston engines are in my opinion wretchedly primitive and obsolete. Light and powerful by the standards of fifty years ago when they were designed they are not now. Additionally they are very expensive inefficient polluting and noisy. Reliability is achieved with the help of ample maintenance at short intervals.
The huge leaps in car engine technology whereby todays engines produce one percent of the pollution of twenty years ago, with power and reliability and so on have completely passed by GA.
There will never be change until it is forced upon the industry. Economics don't do it so it must be legislation. I love light aircraft but this is overdue!