If we were comparing apples and apples then a Gigabit switch would be quoted as 2Gbps vs say a Powerline @ 1.2Gbps.We know the max throughput on ethernet is pretty close to the link rate or within a few percent of it.Powerline throughput varies dramatically and never gets anywhere close to the link rate if you test with something like iPerf.As @Greg Hook tests will show throughput is much much lower than actual link rate.
My point of this as we need ever faster connections for either local network or Internet connections then Powerlines don't cut the mustard.Taking Greg's top numbers for a 1200 variant of 250Mbps (I am sure your average is lower)then that is roughly a quarter of the speed of the connection.
If we introduce such bottlenecks into the network then what is the point of paying for a 1Gbps service and not actually being able to use it (I appreciate parts of the network might be able to get full speed but network design is important to reduce potential bottlenecks)
Powerlines are like the equivalent of setting the speed limit at 70mph then giving everybody push bikes and wondering why you never hit the quoted speed data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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