@Brendon Murphy (meta-androcto) : Think this is about replacing the node setup with a principled shader [so it is better suited for exporting (OBJ, FBX, GLTF -- which rely on the Principled Shader to export textures along...)]
This might not be possible for the "shadeless" setup -- would at least need some further checking, but the for the others, using a principled shader should work out, I guess...
Hi @Himanshi Kalra (calra) !
Thx for your contribution!
Would you mind submitting this as a real patch (this would make it much easier for us in the review process)?
Have a look here https://wiki.blender.org/wiki/Process/Contributing_Code and here https://wiki.blender.org/wiki/Tools/Patches
You can just create a differential and attach it to T66299: Addon "Import images as planes". change node system for better exprting to glTF, lets use this task for this since this is open already.
For sake of clarity, @Himanshi Kalra (calra) contacted me on blender.chat this morning, and gave the answer that anybody is free to modify that add-ons code within the licenses's conditions, as with any other piece of GPL software. What we forbid is committing changes to someone else's add-on without getting them reviewed first. Submitting patches is the way to go, and most welcomed.