Export video for Broadcast TV
Depends on who you ask. Old traditional people who grew up back in the bad old analog days have the Safe Action Area and Safe Title Area embedded in their brains.  But even as old analog TV receivers evolved, there was less and less danger of losing the periphery of the frame to overscan.

With modern LCD, LED, plasma, whatever, TV screens, there is ZERO danger of overscan. It simply doesn't exist anymore. I now use a rule of thumb to keep any text or significant graphics at least 2 or 3% away from the edge, mostly as an aesthetic design rule.