That's missing some of the bigger picture. One of the reasons streaming 4k content is at a lower bitrate is because it has to deal with network hiccups and fit inside the buffer of most playback devices. A computer or phone has plenty of room, but streaming 4K content to a TV or chromecast/roku/firestick/etc. does not. Faster bandwidth means keeping the bucket full more reliably.

For streaming, probably true. However my 2016-era 4K camera records at up to 150Mbps and I noticed recently that due to compression I was totally unable to show off some gorgeous telephoto video of a hummingbird bathing in a river because the fast running water looked truly horrible under compression, even though the original video looked great. I would love 100mpbs streaming options.