Most streamer seems to have them in the A or A+ tier. I don’t recall any claiming they will be as mandotary as they where for push in S4.
Icy vein really lost its touch for WoW in the past few years.
Their talent spec choice are often way off the chart and they even have stats priority wrong on some class. Like Fury warriors.
They are OK if you want to get a fresh start to work on but don’t rely on icy veins anymore for tuning.