The fact you'll get an external display from Apple (if they release 5K external ones), doesn't mean others will get the same setup. That setup is OK for you, but it's selfish to ask for fewer ports as you already cover them with your own options. What if other people needs more ports?
The cable logic is absurd, if you get a USB Hub you will end up having the same amount of cables, it doesn't matter if it's from your Mac or from the hub. You don't want to see cables from your Mac? Use only 1 port with a Hub, but don't ask for less ports just to "have it clean", since others might need those ports. I mean, whats the problem with having 4 ports instead of 2? If you don't want to use them, don't use them, but don't ask for restrictions for others just for your own benefits.
One example: sound cards can't go through hubs, since they cause problems. So 1 external sound card + 1 external display = 2 ports. What about the external controllers through USB, do I have to switch off the display every time I'm using them? Hilarious. More than 2 ports on a professional machine are a MUST, not for you, but for most of us.