Originally Posted by
Firefox72
They are designed that way because Blizzard doesnt want you to endlesly grind Coalescing visions. Its their response to the feedback about the endless AP/Manapearls farm in 8.2 where you could spend hours in Nazjatar hunting every rare for that elusive few manapeals that would help you buy/upgrade a benthic piece that might or might not have had the trait + socket you are looking for and repeat every day.
This is a double edged sword. The good thing is that with the rares and chests droping 10-20 Coalescing visions you don't feel forced to farm them all day to get a cloack upgrade sooner since its not realistic and viable way. If they droped 100-200 Coalescing visions then you would be.
The bad thing is that rares and chests are now just confined to the day when the daily quest is up for you to kill/open 3 of them and don't serve any other purpose.