Satoshi picked that model probably because it's easy to divide by 2 (x >> 2). He didn't want to prematurely optimize or overthink anything because it was a simp

Satoshi picked that model probably because it's easy to divide by 2 (x >> 2). He didn't want to prematurely optimize or overthink anything because it was a simple experiment and nobody could have predicted that Bitcoin will become the mammoth it is now.