Ah, I didn't know this until I read it in your article just now, I'll cut & paste it here:
"Based on our experience with docking stations like the Core V2, Aorus Gaming Box, and Alienware Graphics Dock, the benefits of eGPU are most efficient at the GTX 1050 or GTX 1060 level. Faster GPUs like the GTX 1070 or 1080 can work, but the performance drop compared to a "true" gaming PC equipped with the same graphics card becomes increasingly more severe due to limitations of Thunderbolt 3."
Yeah, so for me that seems like eGPU is not really worth it, because GTX 1060 performance is already easily fitting in thin & light small notebooks. I suppose there's the argument that you can replace the GPU for the next generation, but then you'd still have the bottleneck of Thunderbolt & it would be an even bigger bottleneck with the next generation of cards, because they would be faster. Doesn't seem like a good idea to me.