To avoid re-adjusting brakes and hub gearing so much.
Which replaced by adjusting saddle position and stem length
Luckily the latter are barely noticeably with a long brake hood.
The difference in crank position shouldn't be noticable with 70cm to the rails, and most of the useful BB movement will be fore/aft anyway.
I guess it comes down to how often you remove your wheels, and how easy you'd like that to be.
@edscoble started
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To avoid re-adjusting brakes and hub gearing so much.