I wouldn't say it was exactly left behind, because the average consumer will not really benefit from anything over 1Gbit. 1Gbit is already enough to saturate mo

I wouldn't say it was exactly left behind, because the average consumer will not really benefit from anything over 1Gbit. 1Gbit is already enough to saturate most consumer harddrives. I run 10gbit inside my home and it didn't even cost me that much (if you go with 10Gbit fiber instead of copper) with the sole reasons of getting quicker transfers between my PC and NAS. My NAS has 4 SFP+ ports and functions as a switch. I bought second hand PCIe SFP+ NICs for $40 each and matching transceivers for $15 each. 10M of fiber costs less than $10. There's no point in going higher, because 10Gbit is already way past the sequential writing speed of the drive array in my NAS, and it's pretty much saturating the NVMe cache drive in the NAS or the NVMe storage in my PC. That's not to say you can't go faster, because 100, 200 and 400Gbit are very much possible and in use in datacenters and the like.