With most day to day things being some form of streaming it really hides how painfully slow gigabit is.

Additionally, it's not difficult to fit 10gigabit worth of data munging in a 10-15watt envelope.

Pulling data off of modern professional cameras is an easy example.

Realtek's latest NIC is 10/100/1000/2.5/5/10, has a <2w envelope and has offloading that works (unlike intel).