Is it scientifically backed that sensory signals always go through limbic/emotional brain system?
While it is true that emotional life is largely housed in the limbic system, the model seems to be over-simplistic to me. There are more complex emotions that are housed in the neocortex, not just the limbic system*. However, it can still be useful to teach for layman? Similarly to the triune brain model.
For a good introductory video course on emotion, see Human Emotion, host by June Gruber, prof in Yale.
* I believe I have this claim when watching this course, but I cannot find the particular video that make that statement.