mongolia is now playable from 1444
Lol. My link is from 1.6, and I've screenshots of Mongol Khanate in 1.4 and 1.5. Before the scorched earth nerf they could easily solo Oirate Horde, as it was called back then. They've always been playable. 1.7 is slightly harder than 1.6 due to not ending a war with Manchu if you declare on Oirat during it, but only slightly since you can just jump on Oirat at a moment to set up a stack wipe anyway.