more than HPC
The quote from the network expert seems specific to HPC, of which I think traditionally HPC hasn't used FC anyway, obviously the enterprises use it more.
And small department SAN? Shit I think most small department SANs could get by on 4Gbps FC. I know my mix of 4/8Gbps/16Gbps(switch side only I have no 16G HBAs) still has years of capacity built into it even at 8Gbps speeds. Of course I have no fancy NVMe stuff, just regular flash storage. Even for my newest servers I have no need to go beyond 8Gbps.