Power Limits aside, there are some design considerations that allow for "better" transmission. How these things are tested and rated when it comes to giving that bit of consumer information is probably based on who is testing it and what they want the results to show.
I am hoping someone will bring VM up on their current "advertising" that states that their packages are based on the number of devices you connect. I asked the sales team to not repeat it to me again that the package I was on was not good because of the number of devices I had (tho, he couldnt tell how many I had as I refused to give him the info). But to say that you count your devices to pick your package... That's just wrong.