Who or what is a-shareere? Why give importance to it?

Srimathe Rangaramanuja Mahadesikaya Namaha Srimathe VarAha MahAdEsikAya Namaha Sri Velukkudi Krishnan Swamy Thiruvadigaley Sharanam We understand the shape of devAs=Mantram Why give importance to a-shareere (bodyless) when our Sampradhayam is inclined towards Savisesha SaguNa Brahmam? Dasanudasan