Back to this.
Pretty disappointing if true as this is the only mode without overheating
I'm not remotely knowledgeable about this stuff, but I have an obsessively enquiring mind and an enthusiasm for research, and I can't find anything online to suggest that skipping is anything other than another legitimate way of doing things, with advantages and disadvantages cf. binning.
This DPR thread goes into detail about the pros and cons, and the consensus seems to be that "different" does not equal "worse":
Pixel Binning vs. Skipping vs Oversampling: Sony Alpha Full Frame E-mount Talk Forum: Digital Photography Review
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