Probably never. WiFi still fundamentally works over a shared medium, by clients that talk on the same frequency, and if they interfere, they have to wait a random amount of time and then retry.

Wired switches have dedicated physical cables linking to each client and can buffer packets per-client, buffers that can be flushed at optimal times.

If you could guarantee that (1) you were the only client on the access point and (2) there was zero interference from any nearby access points, then I’d expect the latency/jitter to be comparable. But that’s basically impossible unless you’re inside a faraday cage with direct line of sight.

People who are experts in wireless, when they have the choice, will always pick wired communications where feasible, if latency and jitter matter.

That's the point of the article, that WiFi 8's point is lower latency and more reliability?

> Instead, the organization is focusing on improving the reliability [...]. The stated goals of Wi-Fi 8 include a 25% increase in throughput at different signal-to-interference-and-noise ratio (SINR) levels, reduce latency by 25% for the 95th percentile scenarios with latency, and decrease MAC protocol data unit loss (MPDU) by 25%.

Jitter not explicitly mentioned but high jitter is low reliability so it's an implicit goal. It'll simply be more stable when there are 25% fewer retransmissions needed anyway (of course that's just a goal under some assumed scenario, but say that it's 5% in your setup or whatever)