I often read on forum about some tools, and not sure, but I think that i read something about “ideology” of engine when developers can use best tool for every small task instead of making every tool into Defold. For example using of the Spine.
But strange thing, when we start talking about texture packing - you always ignore this question. You spend your energy for improvements of your own texture packer (that has basic functions) instead of try to eject(open) options of textures and sprites for all users.
Texture packing - old task in gamedev, and today we have a lot of tools for this.
I think supporting of external tool for texture packing - best investion of your time in this direction.