Pruning Roses

I read that we prune roses for our own human purposes. It makes sense to me. But it seems that roses and many other plants, trees included, do much better and look much healthier when they are pruned or trimmed. I can only think that the way plants are situated domestically often protects them predators to whom they would be exposed and in concert with whom they have evolved. So isn't human pruning just a substitute for the foraging that would be done by other animals under wild conditions? A theory based on the agency of allergies comes to mind, one that is often applied to both biological and sociological dynamics. For example, the proliferation of allergies in modern industrial society is theorized to be the result of human immune systems being undertaxed. Without anything to do, they produce bodily reactions that are then pathologized as various diseases, specifically as autoimmune disorders. I think the same malaise can be seen in plants that are not regularly trimmed or nibbled on. In other words: Viva la parassita!