You tried to nerdsnipe someone without mentioning L2 is effectively dead within datacenters since VXLAN became hardware accelerated in both Broadcom and "NVIDIA"(Mellanox) gear. And for those that don't need/care about L2 they don't even bother and run L3 all the way.

EVPN uses BGP to advertise MAC addresses in VXLAN networks which solves looping without magic packets, scales better and is easier to introspect.

And we didn't even get into the provider side which has been using MPLS for decades.

A problem with high bandwidth networking over fiber is that since light refracts within the fiber some light will take a longer path than other, if the widow is too short and you have too much scattering you will drop packets.

So hopefully someone doesn't bend your 100G fiber too much, if that isn't finicky idk what is, DAC cables with twinax solve it short-range for cheaper however.