Confirmed, Endermen do drop dimlets in 1.10.2 but it is VERY rare.
Dire ended up with 2 or 3 octodicted enderman spawners running for days to get them. Because I do not have a server I can leave running I had to setup 2 Extreme reactors and 2 turbines each so could easily run 8 enderman spawners at full speed being killed by diamond spikes with looting 3 and still took me 3-4 3 hour sessions to get the parts I needed to build my Dracomium world, large solid spheres, and my dragon world.
It's slow, power hungry, and massively frustrating but worth it in the end if you want to go all out on Draconic evolution.
I guess the upside is, it's completely passive once you have it set up. This leaves you free to do other things while it collects. Not to mention the metric asston of Ender Pearls you must have now. Now that you got what you came for, you can swap those spawners for other mobs and never worry about mob drops again.