Oh, forgot to mention that plugin perform built-in “tris to quads” operation before applying modifiers.
bpy.ops.mesh.tris_convert_to_quads(face_threshold=…, shape_threshold=…)
i mean, there is no “tech”, this plugin is just a shortcut for 3-4 manual steps. Of course, plugin still useful since now this steps are just a single button away. Just not for $15 useful (IMHO)
Posting this because i just spend $15 for nothing and feel disappointed, sorry for ranting