Latency with Bluetooth is the biggest Achilles heel. You're looking at over 200ms to get from phone to ear. Wired takes about 50ms.
Coincidentally, Apple's touchscreens have about a 50ms response to touch.
With videos, good programming could delay the videos from playing by 200ms to make up for the wireless latency. However, you can never delay moments of user interaction. So, the sounds of typing on the keyboard are going to get to your ear 150ms late. More importantly, sounds in games or instrument apps.
Everyone has different tolerances to latency though. I know my surround drove me up the wall at 100ms off. My friend is a musician who couldn't play guitar hardwired with 40ms latency.