1 . Pruning removes dead leaves and stems of the plant allowing it to stimulate new growth. Which also helps keep the pest away.
2. It gives structure to your plants
3. You can shape your plant as required to look aesthetically pleasing
4. When you prune your plant from top , it gives out more branches from near the cut and that makes your plant look bushier.
5. You can prune your plants in the way that they don’t keep growing vertically & they bush out and make the plant more stronger instead of growing into one thin long stem.
6. When you prune a flowering plant which is only producing leaves , it gives a message to the plant that now it’s time to grow flowers and not leaves.
7. Pruning helps the plant in control and keeps your property safe and to avoid inconvenience by falling of weak branches when the strong wind blows.
So in the end I would recommend to look at your plants and trees and observe as aggressive pruning could do more harm than good.