OPPO is currently thought to have updates for its Reno4 series of premium mid-range phones in the works. The highest-end of these may be the first to launch with the also-rumored Snapdragon 860 processor. This SoC, as the name suggests, is projected to be a "Lite" version of the 865.
https://www.notebookcheck.net/OPPO-may-debut-the-Snapdragon-860-SoC-in-conjunction-with-the-Reno-5-series.489387.0.html
Seems like it may simply be that flagship mobile SoCs have reached the volume of desktop parts that enable this similarly implemented fragmentation largely based on binning.