What is the purpose of using an inclined plane?

In mechanics, simple mechanisms are used to reduce the applied force while maintaining the volume of work performed. The inclined plane is one of the varieties of such simple mechanisms. When it is required to lift a heavy load, weighing P = m ∙ g, where the coefficient g = 9.8 N / kg, to a height h, use an inclined plane of length l with a slope α = arcsin (l / h). Then, instead of the force F = P = m ∙ g, a smaller force is applied to the load F = m ∙ g ∙ sinα. The longer the inclined plane, the less effort has to be applied. In this case, if friction can be neglected, then in both cases (with or without an inclined plane) the same work A = m ∙ g ∙ h is performed.