On the one hand the human body bears within its incredibly complex and rich structures the seal of Divine Wisdom, along with the fullness of natural life and an inexhaustible potential for development. Even after death the human soul differs in principle from an angel's namely in that it retains the full memory of the life of that body which it temporarily, prior to resurrection, has part with. Though some angels possess of ability to settle themselves in the bodies of animals or human beings and feed on their energies, no one of angels will ever have such full knowledge in respect of the human body, not one can have so intimate and profound a bond and unity with every single cell and molecule, which by the nature are peculiar to the human soul.
Yet, on the other hand, how great the misfortunes and limitations are that the body imposes upon man! Hunger, disease, the possibility of being subjected to every conceivable violence, rooting to the spot, ageing and the inevitably of death, all these woes and frailties to which human flesh is subject are unknown to the angel.
Still biblical tradition unreservedly places man above angel. The Holy Scriptures qualify only man as created in God's "image" and "likeness" (Gen. 1:26-27).
Hence it is stated that “we are to judge angels" (1 Cor. 6:3), "for it is not to angels that He has subjected the world to come" (Hebr. 2:5).
Archangel Michael. Mon. of St. Catherin, XIII
Man's distinguishing feature from angel, to wit, his natural body, comprises part and parcel of God's image within man and symbolizes the supreme human worth.
As for the body's sorrowful, morbid condition, that is due to the violation of being's Divine order, wherein the highest serves the lowest and the strongest the weakest. For in our mundane order of living, the sinful soul exploits the body for sake of pleasure or vanity instead of painstakingly fostering it as God's invaluable creation, preparing it to the future resurrection.
What is the designation of angels?
It is to serve humbly in the effort to redeeming and creatively cultivating of nature and mankind, yet withal take up spiritual arms in warring against their mutinous brothers who work violence against nature and the human race.
That is what the Archangel Michael and his angels do.