Hello,
How about the problem with unsealing A grade armor?
While you may have some chance of getting or crafting the armor set you need, unsealing it is harder to do because getting cloth pieces is too expensive. ,60kk-70kk for a single piece seems quite expensive in my opinion.
There are a lot of OE B grade sets, but since I've tarted playing here almost a year ago, I've never seen any considerable change in A grade sets availability or the cloth pieces you need for them.