> It's wild to me that 10gbit isn't the norm by now

I honestly just don't need it. Part of that is my ISP options top out around 1200Mbps, certainly. But I also just don't need that kind of speed inside my home. Streaming video needs at most 20Mbps or so, and I don't do much in the way of large file transfers. And when I do large file transfers, it's usually from or to the internet, and my home network is not the bottleneck there.