The death of a plant or pollinator will affect the species within its module

A plant or pollinator dying off will effect the species in its module, but those effects will be less severe on the rest of the network. Why's all that important?
Because plant pollinator network structure effects the stability of ecosystems. Heterogeneous distribution, nestedness and modularity enable networks to better prevent and respond to extinctions. That's critical because nature is never static. Some species may not show up every year. Plants flower at different times.