Looking at old problems through a new perspective can, sometimes, help as arrive at a solution
For example, arguing about whether the glass is half full or half empty misses the point, which is this: the bartender cheated you.
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I think when old problems are solved, not necessarily some new perspective work. The bone of contention has to be addressed knowingly or unknowingly or dealt with consciously or without conscious effort.
As for example, the misunderstanding factor affecting sometimes the relation beyond repair. But sometimes some new facts come into open and the both persons understood they fought over nothing.
The new perspective work only when the issue is old and some thing new has dawned affecting both in a positive manner or one person will be heavily going down which the other person did not intend.