RF to M Adapter?

Why would you not use EF L glass? My EF 100-400 L Mark 2 gives stunning results on my M6 Mark 2.
Weight and portability. I never used super telephotos to begin with. I had the 16-35 f/4L, 24-70 f/4L, 70-300 f/5.6L, 50 f/1.2L, 135 f/2L, and the 100mm f/2.8L Macro and have gradually replaced them with the EF-M 11-22, 18-150, 55-250, 32, and the Sigma 56mm
 
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