The addon uses attributes so that you can use it even if you didn't take care of the UVs in advance.

In order not to influence the operation of materials that will be connected on the object, the addon, instead of copying nodes from materials on the object, creates their exact copies. This means that after using the addon, you can continue to use the materials that were combined.

Where and who needs it
Game 3D artists
First of all, the addon was created for you. According to my measurements, the addon speeds up texture export by 40 percent or more, depending on the number of materials. Now you don't have to combine textures in Photoshop or using masks in blender
3D visualizers and cinematic artists

Firstly: just like for game 3D artists, my addon will help you bake textures, which will speed up your render by a factor of

Secondly: you will be able to work with all materials at once. For example, add a glow along the edge of the model, to all or part of the materials, without attributes this is quite tedious to do