I think its been obvious for a while that NIN needs a nerf, I don't know of any serious comp that doesn't have one - even back in 3.X. I was shocked that it was actually buffed for SB.
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It wasn't supposed to? It was in response to CecMiller's post about there being a 1- 2% diff in uptime across good players on Susano. I agreed with them... Did you even read it?
You would need to measure across every fight in the game the uptime between BLM and SAM to definitively say one had greater uptime over the other. You dont have that data, I dont have that data. Until then its purely speculation.