The resulting thick growth at the top will prevent sunlight from entering the middle of the plant. No growth will develop inside the plant. If anything damages the greenery at the top of the plant, you have a bunch of ugly sticks. Pruning such a plant by thinnning the number of canes rather than shearing will avoid that problem. That technique will allow sunlight into the plant.
Growth can take place in the interior of the plant with the presence of sunlight.
To make thinning cuts, cut the tall shoots where they originate. Just follow the stem into the center of the plant to find where it branches off another stem. Cut it there. When you finish pruning a plant by thinning, the plant will have a more natural appearance, not appear as a sheared specimen. Research has shown that, if you make a proper cut, it will heal just fine without any dressing.