Calculation Accuracy >

Dependence on computers and calculators can lead to having no understanding of how numbers work, or whether an answer makes sense!

Also, because the soroban's order of operations is from the most significant, to the least significant digit (left digit first), if any errors happen at all, they tend to happen where they won't make the answer ridiculously wrong. So add to the benefits list:

Abacus users are good at estimation and making approximations!