I'm surprised there's so much bitterness in this forum. Does really nobody here see a huge change in the advancements of eGPUs? An external GTX 1080 Ti is going to be far more powerful than anything Apple could reasonably fit into a notebook. And a well done enclosure does not only connect an eGPU, it also does charge the MacBook Pro, and it potentially adds ports or even hard drive bays. It doesn't get more comfortable than simply plugging in a single cable to do all these things at once.
I agree it's all "golden" until you need the performance on the go, then it all rather falls apart. Arguably a desktop solution would serve even better, equally problematic to travel with.
On the Windows side were now seeing very portable notebooks with high power GPU's, full port selections including USB C/TB-3. eGPU's made for good sense when there was a massive disparity between desktop & mobile solutions, in 2018 not so much. A GTX 1080 will always outperform it's mobile counterpart, equally even a GTX 1080 MaxQ will decimate any Mac.
Major thing to take away is; no dongles, no adaptors (certainly fewer), no eGPU required, just solid performing notebooks that are also scalable, and absolutely portable, but they don't look as nice...
Q-6