The reason is because the optimisation and automation means that there are no staff in the stores qualified to 'turn the knob' (and it is more complicated than that). What is the store to do, employ full-time knob-turners? They won't even pay for the uniforms of shelf packers or give them two toilet breaks on a shift.

> What is the store to do, employ full-time knob-turners?

How often do you think the knobs would need to be turned? You think someone or something is constantly fiddling with the temperature knobs of each individual freezer?