My take is that this solves the following elder problems:
There aren't as many elders anymore, so why stress them out? As others noted, this was never done with any regularity even when I was an elder. With so much to do and fewer numbers than ever doing it, why not keep elders fresh for parroting what is in the latest WT from the platform?
With the information age in full bloom, elders are going to run into more "apostates" than ever. Some could absolutely have their faith shaken belief system shattered by facts. Why not pick the low hanging fruit of a lonely desperate soul who comes to the KH asking how they can return? The GB knows that there are some smart former JW's who could mess up what's left of their internal control structure. No need to expose them to the possibility of real information.