In the past, we used to have to deal with the scourge of proprietary phone connectors. Buy a new phone, toss all your old accessories and re-buy cables and chargers. Then Mini-USB started catching on, and everything got a lot easier. Sure, the transition from Mini-USB to Micro-USB meant re-buying stuff, as did the iPhone switch from the old Dock Connector to the Lightning port, but you could better count on a number of people around you using the same accessories as you. It was an actual ecosystem.
Whenever something like a connector changes, people freak out, but the nice thing about the move from MicroUSB2 to MicroUSB3, is that you won’t need any adapters or new cables. The port INCLUDES a USB2 connection. It only adds a couple pins for additional speed and feature support. All of you old cables will still work, so that adapter shown at the top is pretty much useless. It’s a placebo. Please, don’t buy it.
If you need any confirmation, below is a video demo of using a MicroUSB2 Flash Drive adapter on the Galaxy S5’s MicroUSB3 port.