If he did not learn how to master the basics of using that kind of firepower, then he would become more of a burden than actually being able to help others.
There was immense power, so it would come with minimal margin for error.
A cannonball did not need to hit perfectly to cause damage, but if it missed the intended target, then it could destroy something that was not meant to be destroyed.
Similarly, amplified Life Energy would hit something, but without control, it might not be the right thing.
A cannon would have a recoil, so if someone did not brace themselves properly, they could get knocked over and get injured.
Amplified Life Energy could sometimes have a recoil in some cases that could lead to backlash, disorientation, or loss of balance if the user was not properly prepared for the release or they lost control of it.
Without training, Scott could be considered like someone being handed a siege weapon and being told to "good luck".
