I bought the official 7" touch screen. In the instructions, I was told to connect the GND and +5V connectors only, even if 4 wires were shipped. So that's what I did until now and things were working fine.
Today I received another 7" touch screen, but it came without a manual, so I looked up the wiring in the Internet and it told me to connect the SCL and SDA pins as well.
What's the benefit of connecting SCL and SDA to the official 7" touch screen? What can I get out of it?
My OS is Raspbian, which detects the screen automatically. I'm using Pi 2 and Pi 3.