I don't quite understand what you are saying, but I guess that is why my two RF lenses only weigh 3.15 and 2.63 pounds each.To correct geometric distortion and vignetting in zoom lenses, more optical elements are used and result in expensive and heavy lenses. Since mirrosless has high computing power, you can make lens with uncorrected distortion and vignetting, and leave the job to the camera software. Such a thing could not be done with EF lenses, which need to be compatible with photographic film camera (mirrorless does not need). Canon first makes use of a tactic that Sony has been using for a long time.
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