Here's Blizzard's post about the new updates to Coalescing Visions drops: https://us.forums.blizzard.com/en/wow...
Remember - for most players, Coalescing Visions are not a limiting factor, and if you do the non-grindable sources of them you do not need to do any farming! Mementos, however, are potentially worth farming a little, so doing lesser visions for those can be worthwhile.
Check out my twitch stream: / dratnos