Its the same reason we are asked to write exams without using calculators but the real world does have them.
How you work without calculators is a proxy for real world competency.
Funny, you used probably the most useless form of benchmarking used on people as an example of measuring "competency" in the real world.
Funny, you used probably the most useless form of benchmarking used on people as an example of measuring "competency" in the real world.