Comment by unrented7977

Not theory, this is literally just how it works. Only one device can transmit on a WiFi channel at any given moment. A whole lot of the WiFi standard is just dealing with scheduling multiple clients wanting to transmit on the same channel at the same time.

The more clients you have on the same channel, the less bandwidth they all get (effectively). Using wires where you can will improve wireless for everyone else, including your neighbors.