Your comments only apply to traffic on a separate layer-2 broadcast domain (uplink). Who has a gigabit uplink anyway? This statement is absolutely false for LA

Your comments only apply to traffic on a separate layer-2 broadcast domain (uplink). Who has a gigabit uplink anyway? This statement is absolutely false for LAN traffic: "This is no different from a Ethernet gigabit switch". Even inexpensive gigabit switches are non-blocking these days. This means that they have enough bandwidth for all devices on the LAN to talk to each other at full throughput. This is where the real value of gigabit ethernet comes in. If you need to transfer large files over your LAN, a wired gigabit switch is going to far outperform gigabit wireless.