More concerned where the wiring in our brain will be when we cannot add or subtract, do anything manually?
This is why I am teaching Smallsteps the manual methods first. She can leverage digital later.
Too many are making decisions out of convenience to "save" when they aren't calculating the true costs.
Costing was one of my favourites being in manufacturing/shipping, test software was working correctly in calculations, always manual then loaded, a dual check.
Fingers and toes, abacus makes no difference one should know the equations not rely on digital fully.