I think a better assumption can be made instead of what Ken H wrote.
Assuming that Thomas Sowell doesn't use Open Source software, we can conclude that in general most commercial software (including , but not limited to Microsoft's offerings) is not easy to use in Thomas Sowell's eyes. This can be a good opportunity for Open Source software community to stay ahead of the curve and ensure that usability is not compromized.
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I think a better assumption can be made instead of what Ken H wrote.
Assuming that Thomas Sowell doesn't use Open Source software, we can conclude that in general most commercial software (including , but not limited to Microsoft's offerings) is not easy to use in Thomas Sowell's eyes. This can be a good opportunity for Open Source software community to stay ahead of the curve and ensure that usability is not compromized.