Same2: “The Rambam does say that requesting something of angels is Apikorsus as it is attributing a solely Divine purpose to any being other than Hakadosh Baruch Hu.”
Where does he say that?
Requesting as a form of prayer is a prayer. If I request of an angel to grant me health, I would be asking the angel to confer that benefit on me when that benefit comes solely from God.
If I Request of you to hold the door open for me am I an apikorus since I am requesting something from a power other than God?
No, since God gave you the power to hold open doors, hence I am not praying, just asking you to do something that you are able to do. If Hashem created angels with the ability to bring prayers from people to him then how is that different than asking you to hold open a door?
(Obviously Hashem does not need them to do that anymore than he needs rain to make plants grow. This is simply what He willed.)