Load balancers have evolved from layer 4 devices to ADCs and WAFs. Administration and management has changed from the network engineering team to the DevOps/Web/SecOps teams. I have personally never seen a network load balancer (balancing Layer 4 protocols between links).
I have seen it in a "traditional" mode (where the lb shares traffic listening to port 80), but that's because the team did not want to change the mode into a L7 device (if it works, don't fix it).
I have never seen anything else being load-balanced apart from HTTP/S traffic. Even DNS traffic is being advertised as anycast instead of being load-balanced.
Do you have L4 LB in production? Or have you seen any in your life?
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