If vascular plants are more advantageous than nonvascular how come there are still nonvascular plants?

Question

If vascular plants are more advantageous than nonvascular how come there are still nonvascular plants?

Answer 1

Well there are many examples of so-called lower species surviving happily alongside the more advanced ones. For instance cold blooded creatures still co-exist with warm blooded forms. The more derived species fit into a different niche to the basal forms and if not the latter are displaced.