Pretty much all serious players I know share the opinion that ST BW is even worse off in Ranked than Sorc, and can back this up with facts/experience/data, etc. Threads have been made detailing the issues, presenting solutions, etc.
Players that cry about OP ST BW are the same type of people that cry about OP ST Sorc: players who get time-stamped because they are slow, unaware, unsupported, etc.
Their cries don't matter, because they're unsubstantiated, so this is hardly any kind of justification for the nerf that is on the table now.
Though I am not sure where that 10% figure comes from, 10% is an absolutely massive difference. Why do you think Bloodlord with its 5% damage increase is BiS for virtually every DPS class?
And I use Shadow of Disaster in my ST specs, and I know other Sorcs in Ranked use it too. In fact, I find it hard to think of a workable ST Sorc spec that doesn't use it.
The statement that "no sorcs use this tactics" is rather suspect. People who make it likely know little about Sorc. The fact that you're even willing to parrot such statements also makes me doubt how much you know about Sorc.