When using an MHL cable with a 5-pin Micro USB plug to send content to a large screen via HDMI or VGA, an 11-to-5 pin adapter was required (see MHL). See Samsung 30-pin connector.

In both cases, GND moved from pin 4 (on standard Type-A and Type-B) to pin 5, with pin 4 now used to support optional On-The-Go support. The Type-A variants of both of these smaller USB connector ...

Apple's new port supports an 8-pin connection, which is more powerful than Micro-USB. Brockerhoof explained that the industry-standard Micro-USB plug only has 5 pins, which wouldn't allow most ...

The USB Promoter Group says the Type-C connector is rated to the same 10,000 cycles as Micro-USB, though I'm sure the more-complex design and smaller pins might cause some issues.