Hi Overwatch, I remember stating that Sigma has the potential of being off tank. He could keep deploying his Experimental Barrier every time someone flanks his team. This could discourage flanking, as a counter.
And I said 1.5s, 1.75s or 2s would be ok. But honestly, flankers could flank and pop up again in less than 2s. A 1.5s or 1.75s cooldown, on Experimental Barrier, will still allow for counter play. But it would also allow Sigma to perform with a new role, as off tank, pealing for his team.
This could be tested on Experimental.