The purpose of basic training is to turn civilians into soldiers (not warriors, soldiers.) Prior to the modern army (as deployed by the Romans), battles were fought by a combination of highly-trained elite units (cavalry, well-trained melee combatants, etc.) and cowed peasants forced into battle at sword point. (As you might imagine, other than as a meat-shield vs. other peasants, this was not particularly useful.)
Starting with the Romans, Western Armies took conscripts (or volunteers) and trained them, first and foremost, to follow orders as a unit without question (as in, not prod them in the back with a spear all the time). At the same time, they were taught basic combat skills. Such soldiers were certainly more effective than cowed peasants, and in many situations more effective than independently trained elite warriors, since they could function as a cohesive team.
Nothing hackers do requires orders to be followed in seconds. Their orders do not involve putting themselves in the way of personal harm, so they don't need indoctrination/brainwashing to work against their natural survival instincts.
Certainly you DO need them to follow orders, and a cohesive unit can be good for morale (this doesn't just apply to the military), but there have to be better ways to do it vs. basic training, and you'll needlessly exclude those with perfectly usable skills unsuited for traditional basic. (I will note that Army Basic, while tough, is not actually that hard to pass, physically. You need to be in decent shape by the end, yes, but not an athlete. It's the mental demands that causes the most flunk-outs.)