In the days of DSLRs, even when your camera was on a tripod, it was possible to get a little motion blur in your shots due to what we called “mirror slap”. In these mirrorless days, mirror slap isn’t really a thing anymore, but there is a chance that the vibrations from the shutter can cause the tiniest of motion blur. With lower resolution cameras, it’s not much of an issue, but with cameras getting higher and higher resolution with each new generation, it may become one.
There’s also the hope that Canon expected to announce a high-resolution monster soon, which would make any potential blur from the shutter moving quickly more noticeable. So, Canon has patented a new mechanical shutter design to help minimise the “shutter shock” vibrations caused by fast-moving shutters suddenly reaching their end limits.