It’s for efficiency and ergonomics. Your fingers never need to move further than one key away. Your pinkies will thank you for not having to use all those keys.
Instead of two thumbs covering only one giant key (space), you give each thumb 2-3 keys. And 1-2 of those are to shift layers, so it becomes pretty natural once you get over a learning curve.
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It’s for efficiency and ergonomics. Your fingers never need to move further than one key away. Your pinkies will thank you for not having to use all those keys.
Instead of two thumbs covering only one giant key (space), you give each thumb 2-3 keys. And 1-2 of those are to shift layers, so it becomes pretty natural once you get over a learning curve.