The point of having a wireless chip you can actually fully turn off, and on most built-in ones stay active until you literally pull the battery, is that you get to decide when the utility of cellphone service outweighs the risk. Loading from ROM, turning it off will also wipes any hack. Which is not the case with built in ones that stay running when you turn off the device.
What makes Intel’s ME and AMD’s PSP far less of an issue is that they don’t communicate with the outside world. Only way to hack them is thru physical access to the device and in that case all bets are off anyway. Wireless chipsets on the other hand are what devices use communicate with the outside world so once they’re compromised all bets are off. Even more so when a hack may last the lifespan of the device and be almost completely undetectable by the OS.
As much as you like to push all those android derivatives, they’re all pretty amateur stuff in terms of privacy compared to the Librem 5 and similar devices. Maybe that’s why you’re so hellbent on craptalking it. So its just you being insecure. Sort of like how Windows sysadmins will endlessly craptalk Linux and Mac. Trying to find any excuse to keep them from their network and needing to confront the fact that they don’t know anywhere near as much as they think they do.