Thirds are Useful for beginners getting into composition.
But they must also learn that it is not the only way to compose, nor is it a rule.
You can also add energy and tension by just avoiding the intersection of thirds.
The intersections have a strong "pull" and tension is created by near misses.
Other shapes also create strong compositions...
Leading lines
S curves
Triangles
and virtually any linked shape.
Groups of things are also useful ... a group of 3 is easier on the eye than a group of four
However four objects grouped as a group of 3 and a 1 work fine. (even numbers are the problem)
The problem with thirds is that it is used too often, and can become repetitive if it is the only aid to composition you know.