History has always confirmed that the mantra of "we'll never need xxx that fast or that much" has always been proven false over time for computer hardware. Eventually, I'm sure there will be advantages, and it will become the minimum, not the average or maximum desired performance. It is inevitable. In the short term? Of course not.
There are major advantages for faster PCIe, because fewer wires/lanes, are needed to achieve higher performance. Anytime you can reduce wires, you reduce cost and complexity. In addition, it will allow for many more PCIe lanes per channel. It has major advantages, outside of pure throughput.
As for what they mean by it is full release, I suspect they mean this is when the draft becomes gold and finalized, and specs sent to manufactures to start designing parts. Which means, actual hardware release will come much later, I'd suspect 2026 and beyond. Naturally, it will come to server and enterprise-grade equipment first, and then start to trickle down to the little people.