The aircraft portion yes but the other side of that system use is everybody's individual laptop, ipad, cell phone.........whatever, that have not gone through that same certification process.......which was my point.
How do you think the testing is carried out? Multiple commercially available personal devices are connected to the network in flight.
All personal devices regulate their signal strength in order to preserve battery life. They will transmit on the lowest possible power setting that allows a reliable connection without data loss or signal drop, hence the use of a leaky feeder running throughout the cabin, as opposed to a single central antenna.