Said it many times before but I'm goona say it again
IMHO a SYE is recommended STOCK & the Jeep bean-counter that convinced the engineers that a Slip Yoke is a good idea deserves a big kick up the butt.
You can get away with upto 3-4" lift without a SYE - but I'll never recommend it cause I hate the slip yoke so much.
Ahhh yes I still remember limping hope with a broken transfer case and the extra cost - thanks jeep bean-counter....(at the time I had 2" lift & 31"s with a heavy right foot)....
A body lift has no impact on the requirement of a SYE as it does not lift the driveline. But it can stretch the t/case shift linkage - especially with a t/case drop as will (ie no SYE).
In my personal experience I found with 2" BL the body mounts were more exposed and during rock hoping they were more prone to snagging/damage, also IMHO they look a little ugly.