At 25 Gbit/s your computer may likely not be able to keep up, unless you have NVME based SSD. We are talking about 3GB/s+ which my 24-drive NAS (old) can’t get beyond 2.6 GB/s with ZFS.
Absolute madness. But this kind of bandwidth isn’t meant for a single machine.
In the end it's just an arms race with basically no use cases. You could call it future proofing but the switches will have to be replaced before such speeds could realistically be used (8k/16k video or sth like that?)
Having fiber without pon is great, means no new infrastructure for decades. But anything above 10gbits will be too much to use realistically, even for smaller companies.
Well, the use case is multiple people doing things at the same location that add up to more than 1Gbit. For example, think of the connection on a switch with mostly 1Gbit ports but one or two 10Gbit or 25Gbit ports for the uplink. Switches such as this will also have a backplane capable of doing more than 1Gbit.
Individually no one person/port can use more than a gigabit and can't saturate the switch in this case, but combined they could utilize far more.
Absolute madness. But this kind of bandwidth isn’t meant for a single machine.