What exactly is the philosophy behind sending blessings and prayer to our prophet in case of Allah and the angels?

Allah ordered us to send prayers and blessings to our prophet () saying: > Indeed, Allah confers blessing upon the Prophet, and His angels [ask Him to do so]. O you who have believed, ask [ Allah to confer] blessing upon him and ask [ Allah to grant him] peace.(33:56 ) from the sunnah we know the rewards and wording for those who do perform this deed. But what exactly is the case for Allah and the angels when they sent prayers and blessing to our prophet ()? Is there a benefit for Allah in doing this, I might assume that there is for the angels at least ... so my question might be why and how is Allah doing this then and how and what is the deeper meaning or the philosophy behind this???