The problem is produced by patterns in a subject mixing funny with the pattern of the sensor light sucking devices. There are subjects that are more prone to creating moire and false colors and that doesn't change, but apparently the newer sensor/software combos can handle it better.
My understanding (might be wrong) is that larger format cameras do not have OLPFs, but they are mostly used where the lighting and subject are completely controlled and the photographer can avoid the patterns in subjects and lighting that are prone to produce problems.
So, theoretically you could remove the OLPF from any camera and images that would not have been affected by moire/false colors would be sharper. But, the question for the older camera with OLPF removed would be, what about the subject that produces moire/false colors????
And yes, even a new camera may need a little more post if the subject/lighting mixes funny with the sensor light sucking devices (at least Nikon seems to think this way).