If vascular plants have so many advantages, why do you think nonvascular plants still exist on earth today?

We all know that vascular plants really have many advantages. These refer to trees and flowering plants which really gives us what we need. While nonvascular plants are those small and simple plants which do not have any phloem or xylem. Despite nonvascular plants do not have as many advantages as the vascular plant to the people. They still played a big function in our ecosystem. For example, the algae, algae serve as the food of some of fishes in the pond or lakes. Non-vascular plants are also involved in processes like decomposition and indicators.