Good brake down.
Well then the thing might be that she is the best starter class since forever and those charms gave just more reasons to play her. Besides immunities there’s also a matter of teleport. Every patch since D2 release Sorcs benefit most while Barbs get almost nothing.
These youtubers are from maxroll or icy veins websites. Even before Sunder Charms they put Blizzard as S tier build on level with Hammerdin and others.
MrLlama on PTR was saying Blizzard Sorc is broken but when patch hits live he suddenly changes his mind. Kinda weird huh?