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SCBF Compressible Material?

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For Steel Special Concentrically Braced Frame (SCBF), I always saw the Contractor using Styrofoams at both sides of the embedded gusset plate as the compressible material to eliminate the lateral restraint. 
Recently there is a project that the Contractor using the "JOINT FILLER" (Fibre Expansion Joint by W. R. Meadows, Inc.; similar to the one you saw on your concrete driveway as the concrete divider but harder) instead of the Styrofoam. The Contractor and the Design professionals claimed that this FILLER were used for MANY projects in the past several years in SCBF design/construction.
Can you let me know your opinion regarding those rigid-like filler for SCBF?
My opinion: That filler will provide excessive lateral restraint and will prevent the brace to buckle in pin-pin shape. If the brace did not buckle at the designated force level (lost the function as the FUSE system), then other portion of the frames (columns, beams, joints, connections) might fail before the actual brace buckling. The designer's nightmare of sudden building collapse might occur since the brace wouldn't buckle (dispatchs the energy and also acts as the warning sign) at that designated seismic force.
J. Lin, SE
Los Angeles

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