Some files in Retroarch.7Z are unnecessary?

Hello. I see in RetroarchX.7Z from some files how if are unnecessary.

/retroarch/assets/pkg/wiiu/ /retroarch/assets/pkg/ /retroarch/assets/switch/ /retroarch/autoconfig/parport/ /retroarch/overlays/wii/

Is how if the folders above are in Retroarch PC file version because are inside the source code when compiling. Is possible remove the folders above not breaking any Retroarch feature ?

Is possible also remove /retroarch/shaders/shaders_cg ? I not use any shader from that folder.

Thanks for read.