To my knowledge, bearded iris do not provide benefits to birds and insects. Their scent may draw pollinators for the nectar, if any in the flowers. The leaves would not provide any type of habitat for birds or pollinators.
Please review the above link to plant vegetation that will benefit pollinators.
This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.