It was also precision.
Back in the oldje days of film, a camera kept the planes of film and lenses located.
Do any one else remember knowing that *this* lens was off on one side? They fixed that.
Or having to hold a lens *just so* to keep the barrels and elements aligned? Fixed.
Or that *this* camera's cloth shutter was a bit slow- good for dimmer lighting? Fixed.
Also back them days, some folk couldn'''t invest in the whole kit.
There were adapters to put their lenses on your brand of camera.
And vice versa.
It was easier to take better pictures without worrying about the vagaries of equipment combos.
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