That's difficult in my opinion. But that's mainly due to my belief that the anime is a basis for the changes in the manga. But in the end, that's all I want; an explanation. Goku being an idiot savant can only go so far.
The problem I see with this though, is it makes things a little bit too easy. if Goku really wanted to get better with this technique, then we have a character not on the same standing as the gods of destruction being able to wipe people from existence. The issue here is the destruction technique is not, or seemingly not like the solar flare for instance. If this is really Beerus's technique, then that means that it has the same effect as his technique. If that's the case, then every major foe from here on out would only last simply due to the fact of Goku wanting a challenge. Which is kind of dumb, in my opinion.