Actually, this is largely true even for other professions. A chef for example will slow down significantly after 5 hours of work and make more mistakes, so will

Actually, this is largely true even for other professions. A chef for example will slow down significantly after 5 hours of work and make more mistakes, so will manufacturing line workers and call center operators. For sure, some jobs are more affected than others. But there are few jobs that aren't affected at all, and we shouldn't cut off the nose to spite the face.