People have been saying this literally for 20 years now, yet even the fastest 6E wifi with compatible devices and router can barely break 1Gbps barrier in real life use(for me), and majority of the time I see it's much less than that. I mean it's great seeing real life 300-500mbps over wifi, don't get me wrong, but all this incredibly fancy(and very expensive) tech doesn't seem to beat a basic £5 cable quite yet.

Not to mention, ping, jitter and packet loss are all better with ethernet.

Most users never until you put them in a situation where their performance is dependent of those factors, like gaming.

I feel like they do notice but they blame other parts of the chain first, like their ISP.

You're right - its just too unpredictable. The bit that gets me is the hardware in laptops / devices. Apple seem to take some care in antenna design etc, and appear to be fairly fast / reliable, but many device manufacturers stick in whatever, if you get a link then great, call it a day.

Are you planning on discovering some new laws of physics?