Yes, I mean, that’s also a possibility - or someone didn’t know they needed to screw on the antenna, or it’s otherwise borked. Every PC motherboard (sample size of four, three for me and one for a nephew) I’ve bought in the last five years has had on-board WiFi and Bluetooth though, so I’m curious to know, was that a deliberate choice?
(In thinking about it, it’s possible that the motherboards I bought did have non-wireless alternatives that weren’t stocked at my local Micro Center - lot of digging required to figure that out, though :) )