Here is a very interesting reply from Blue Jeans cable when I asked about Cat8 cable.
Begin forwarded message:
From: Blue Jeans Cable <sales@bluejeanscable.com>
Date: February 25, 2022 at 10:09:12 AM PST
To:
Subject: Re: Cat 8 Cables ?
There is CAT8 bulk cable, and a spec for using it in BaseT applications, but no spec for ethernet patch cords. So one could buy the bulk wire and put RJ45 connectors, but wouldn't be able to certify it to any spec or confirm that it passes any more information than CAT6A.
-- Jeff
Blue Jeans Cable
sales@bluejeanscable.com