https://mathematicalmulticore.wordpress.com/2010/01/09/should-a-keyboard-layout-optimize-for-hand-alternation-or-for-rolls/
Another argument is that one of the very few keyboard layouts that was created by actual scientists (dvorak) focuses on hand alternation as well. Although that's not a particularly strong argument. But I'm sure a lot of typists disagree with your assessment and find hand alternation to cause less strain, which is even intuitively easy to understand.
https://mathematicalmulticore.wordpress.com/2010/01/09/should-a-keyboard-layout-optimize-for-hand-alternation-or-for-rolls/
Another argument is that one of the very few keyboard layouts that was created by actual scientists (dvorak) focuses on hand alternation as well. Although that's not a particularly strong argument. But I'm sure a lot of typists disagree with your assessment and find hand alternation to cause less strain, which is even intuitively easy to understand.