Because unlike other forces, gravitational force attracts one into each other. So it doesn't cancel with each other. By that nature of gravity, all cosmological objects (star,planets, galaxy, cluster etc.)are found to exist in the universe.Thus we say gravity is so beautiful.
Though according to modern theory it is different from Newtonian theory of gravity. General relativity theory of Einstein told us that any mass bends the spacetime fabric in 4D cases, and for that bending the body experiences gravity.
Now let's reimagine the space time curvature theory. Suppose theire are two massive objects - Earth and Sun. As Sun is more massive,it creates more curvature in the space-time curvature so that smaller masses (earth) revolves around the sun inevitably.
Without gravity there would remain all those energies as useless (as like heat death). And the role of dark energy would be prominent.
Image Source: Space