The root cause of the failures in the 110's really isn't the lifters themselves, but rather the combination of high lift with abrupt lobe ramps, heavy valves, and high spring pressure. Needle and roller bearings do not tolerate constant pounding very well, so it is best to avoid designing a valve train that beats the snot out of the lifter roller bearings. Kind of like it's not good to severely lug a roller bearing enigne until you pound the crap out of the crank and rod bearings.
Even with the higher capacity roller bearings in the SE lifter, those have also failed in 110's. I assume they lasted a bit longer (the real reason Harley started installing them in 2013 in my humble opinion was to stretch out the average miles to failure to reduce their warranty costs, not because it was an actual fix for the problem), but they eventually fail as well. I'm going to guess that the reason the S&S representative recommended changing his lifters at 20k miles is due to the engine they are being installed in. I'm sure they know the root cause of the stock lifter failures is a valve train system issue, not just the lifters.
JMHO - Jerry