Amusement: if you had a Nikon F3 in the 1980's, you were running the best kit any photojournalist could ever want. The standard motor drive attachment ran it at a whopping 3 frames per second. (Wikipedia says there was a limited-edition half-silvered mirror that let the camera shoot at 11 fps.)

Today, just about any consumer DSLR will happily give you 3 fps and the pro cameras are 8 fps or more. Clearly, they've done amazing things by evolving the mirror mechanism, but it's also an obvious target for elimination to save costs further in low-end cameras.