It gets recommended because much of the time coax is not available, so the options are use powerline, use wifi, run cabling around walls, or run cabling through

It gets recommended because much of the time coax is not available, so the options are use powerline, use wifi, run cabling around walls, or run cabling through walls. The first two are far easier and less costly in time or money than the latter two, but each has downsides depending in your specific situation.