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"We do two tests under some interferes as below, the Powerline speed between TL-WPA8630 and two TL-PA8010 can be only up to 364Mbps and 56Mbps. However, the conversion rate (The ratio of transmission rate and Powerline rate) is about 30%-35%(the actual conversion rate depends on the electric wiring system). So the actual throughput should be about 109Mbps-127Mbps. ... Let’s assume the Powerline speed between the TL-WPA8630 and TL-PA8010 is 1000Mbps in an ideal environment with few interferes, normally it will make an actual throughput of 300Mbps-350Mbps. This rule basically applies to all Home Plug AV products."
So that's a vendor saying to expect powerline "AV1300 gigabit" to deliver between 109 and 350 Mbps, possibly lower. And it'll have higher latency.
Similar considerations can apply to wifi.
Ethernet cables and routers tend to* deliver exactly what the combined specs of cable and ports say, and with very low latency.
* In one very unusual case I encountered a business router that couldn't keep up with the number of packets it was being asked to forward. A change to a model with two CPUs or changing some server settings were two of the possible resolutions for that.
Of course there are cases where they make sense, notably where convenience is more important than speed or where they are faster than needed and latency of the level they deliver won't be a problem.
