Thanks We're working to bring RAM upgrades available to 2012-2015 retina MBP's next via a mail-in service. Every site says it's not possible to upgrade RAM, ha! Challenge accepted.I GOT a 16 inches and returned it to Apple. I keep prefering my 17 mate screen, and really can´t bear the plethora of adapters for thunderbolt 3. It´s ridiculous. For heavy duties I have my Mac Pro.
And with this new module from @troop231 , has everything an actual apple laptop has.
I have "normal" USB Ports, Thunderbolt, ethernet, Firewire, etc, even an Expresscard port where I have USB 3.0, or an ESATA card, it depends. For me, best Apple laptop ever.
I live in Spain. And I have been looking again. As I told almost 2 months. You szhould receiver it very soon. Don´t worry.-
Keep the older and more reliable MacBooks running!