The thing is, why is there only one port? It's not like the size couldn't have supported a second one.
Please have a look at the tear down and identify where you'd have placed a second port given the current design.
https://www.ifixit.com/Teardown/Retina+MacBook+2015+Teardown/39841
The back edge is occluded by the screen lid when open, so that's not available.
Front edge is too thin.
On the sides, the keyboard extends too close to the edge to allow ports under the keyboard, and the bottom casing is too thin for ports forward of the keyboard.
To the rear of the keyboard there is sufficient room for a port on each side between the keyboard and the corner radius.
So, where should that port have gone?
Yes, had it been designed differently, deeper or wider or thicker, they would have made room for more ports.
Obviously they chose this design knowing some quantity of people will choose not to buy it.
I imagine they expected those who are stuck with legacy stuff they need to use so often while mobile as to eschew this machine would likely also need more power and buy a higher model.
Why bring it up? Because it's a deal-breaker for people like me
I wasn't aware that Apple built their systems to be all things to all people? They currently have three different MacBook lines, and two of those each have two different screen & chassis sizes. That one of these five different models doesn't meet your needs is not exactly the end of the world for anyone.
I think it needs to be said for Apple to hear it.
Then post your assessment on Apple's boards where they're more likely to see it rather than as a comment on page three of a thread on an outside company's forums.