It's never required, but in instances where you need a lot of articulation, it'll help add articulation in the front, keeping your wheels planted and giving you better grip. I almost never disconnect. Every once in a while a wheel lifts off the ground because of this but I usually have enough traction. Rock crawling is an instance where disconnecting could help you a lot
"You didn't buy it to look at it!"
2000 TJ Solar yellow, 3.73, 178k, limited slip D44
2012 GMC sierra crew cab--Daily Driver
2008 jk X 6spd Red Rock---Sold and missed