For what do you need redidential 25 Gbit/sec? Just because you can? Honest question.
However residential broadband for Internet access does not have to be all about ingress and consumption. There is a future where egress and peer to peer traffic is just as viable. Having a network where the nodes are at 25gbit/sec would be wholesome to say it mildly, and ridiculously modernized to put it plainly.
Asked another way: are there any current fringe use cases for residential users to make use of this kind of bandwidth?
*edit: ugh. Sorry, replied to the wrong comment.
- cloud storage, sharing and backup - at 40Mbit a remote site feels like a slow thumb drive where copying a 1GB folder of an image or video project to the cloud takes 5 minutes, at 1Gbit it feels like a modern hard drive where that folder takes 10 seconds and doesn't interrupt your workflow
- high res video streaming (3-4 people in your household streaming at 4K will overload your downlink at 100Mbit)
- high res video conferencing (3-4 people in your household being in zoom calls at the same time will likely overload your uplink at 40Mbit)
Also, you'll have economy of scale. If every network kit was 25Gbit, then that gets cheaper for all.
Also, the cost of installing is usually the most expensive part, not the hardware. Why no future proof for the next 40 years.
that's the point, right there, the one you're missing.
pushing speeds enable for new stuff to be done.