Thank you for your feedback.
The Factorio interface consists of layers superimposed on each other. In places where there are many layers, the interface becomes less transparent. Joints and graphic artifacts become visible.
Also, I can't add blur to the interface, this can only be done in the Factorio engine itself.
So far I haven't figured out how to make a good transparent interface.
Maybe later I'll come up with a clever trick. Or maybe not.