Because it is still line of site. Although not likely to happen often, what will happen if someone walks between the MRF350 and your equipment while you are triggering a macro? If you want to give it a go, then go for it, and you may very well be happy with is set up like this. I personally would never do this, and would rather have emitters placed on each piece of equipment. It would work a lot better, I can assign the ports, and I wouldn't have a piece of equipment on my side table.