Why would most people need a home server rack? That's a lot of noise, space, and electrical usage. For what most people would need a home "server" for a NUC PC or Mac Mini would do the job.
Is this for people trying to start the next netflix out of their garage before they have any money to put the servers in a colo?
Mostly because the base Mini has Thunderbolt 4 which maxes out at 40Gbps. Anything with a PCIe 4.0 x16 slot will take a 100Gbps NIC. 100Gbps is around 10GBps (8 bits per byte plus encapsulation overhead). Desktop CPUs can do AES-GCM at 2.5GBps+ per core and have up to 16 cores and around 50GBps of memory bandwidth (dual channel DDR4-3200), so the NIC still seems like the bottleneck.
Degrowthing is dumb, people will find use if they have more.