Well that's silly, since we know the entire baseband is compromised anyway. In reality it's all about your threat model.

I refuse put the NSA in my threat model. If we get to that point as a business, we're going to have warrants blowing us up, secret fisa courts threatening our livelyhoods, and so forth.

However - there's no reason we should allow all advertisers to track us just because we are worried about the NSA

You may be interested in Precursor, for which you indeed can confirm that manually: https://www.crowdsupply.com/sutajio-kosagi/precursor. (But it has no modem.)