ios build size is bigger on device

Question

After reading other questions here, still, no solution found, I'm ok with the size of my textures and no need to compress anymore- 1. Why does it show Complete build size - 1112.5 mb while my textures are only 329.7 mb (on other questions here they say it won't affect the final size on the device, but it's not my case- ) 2. When building on the device, I can check the phone storage and see that the app takes 732MB, how come??

I feel like Unity/Xcode builds a lot of extra junk

Here is my build report- Unity 2018.3.9f1

Textures 329.7 mb 74.9% 
Meshes 3.3 mb 0.8% 
Animations 4.2 mb 0.9% 
Sounds 5.0 mb 1.1% 
Shaders 2.4 mb 0.5% 
Other Assets 73.7 mb 16.7% 
Levels 17.6 mb 4.0% 
Scripts 626.3 kb 0.1% 
Included DLLs 2.9 mb 0.7% 
File headers 1.0 mb 0.2% 
Total User Assets 440.4 mb 100.0% 
Complete build size 1112.5 mb

size on iphone- 732MB

Answer 1

1. Complete build size means the unzip size(1112.5MB), iOS *.ipa file is a zip file in fact(732MB).
2. Beside Unity Assets, the IL2CPP Code can take a lot space, you can reduce by only supporting ARM64. Other tricks like reduce C# Generic and Struct-Array.