As far as I know aura act more like a storage of informations. Your aura interact with auras of other people, animals, plants etc… (and yeah, even DW fields)
The more holes your aura has the more you can pick unwanted information from the outside and then get influenced by others stored informations.
Also infos about traumatic events etc get stored here.
So its important to repair it (to be less vulnerable to outside influences/unwanted informations)
New Release: Aura and Energy Body Repair
And clear/clean it from time to time
Energy Body/Aura Deep Clearing Cleaning
Yes its possible that surgeries damaged energy system and interrupt the free flow of qi