I think it's too early to tell if the wifi issues hardware related (doubt it).Using a rMB. USB-C is not the biggest issue though I did have to buy a sidebar adapter. The biggest two issues: First, the USB-C would not accommodate my iPhone or iPad. It would not accommodate any of my existing peripherals. You had to buy adapters.
Second, the wireless was less than great. So many times it just dropped my wireless HDD, wireless card reader, or wireless Hp Laserjet Pro. Many times the WiFi just never came back on after sleep. It is all the little stuff.
Forward thinking - yes. Optimal - no.
As for adapters, meh. Buy a set of the appropriate ones and use them until the next major USB form factor overall comes along well after 2020. I personally don't see the big deal, but I understand the frustration.