> I guess I'm getting old, but I have to wonder what people are doing that they need more than a gigabit.

I have a hard time believing there is anything they can do to saturate 1 Gbps connection at home. It's probably just bragging rights on speed test reports, without any relevance to real usage.

You don’t really need it but it is nice when downloads are really fast. Though most services cap downloads at 2 - 3 Gbit/s.

If you're downloading AI model files, which are tens or hundreds of gigabytes, or downloading large datasets to fine tune them, and then uploading them to various cloud providers, you start waiting around a lot. Uploading videos to be processed on a cloud GPU to produce gaussian splats and then you have to wait and download the results.