It’s highly annoying and demotivating to be permanently behind on cloak resistance past lvl 15. It literally keeps me from playing my alts in higher content (M+ and mythic N’yalotha).
As per usual blizz will probably identify this issue about 2 weeks before the Shadowlands prepatch when it’s too late.
They did a hotfix to increase the rank 4 paragon RNG drop chance yet they can’t do a hotfix to make the +3 corruption give more for people who are behind.
The current Blizzard strategy is to make the game only playable on mains and thus dissuade players spending too much time actually in-game (maybe it a server issues).
Id take their suggestion and just un-sub until Shadowlands.