Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?

(N/A) Benzene is a planar molecule having delocalized $\pi$ electrons above and below the plane of the ring.
Hence,it is electron-rich.
As a result,it is highly attractive to electron-deficient species,i.e.,electrophiles.
Therefore,it undergoes electrophilic substitution reactions very easily.
Nucleophiles are electron-rich species.
Hence,they are repelled by the electron-rich benzene ring.
Consequently,benzene undergoes nucleophilic substitutions with difficulty.