I'm pretty sure it is illegal for airplane mode not to halt all
   transmissions.
   Of course this won't matter.
   I looked into my BIOS settings and apparently there is spread-spectrum
   modulation to reduce EMI? No idea if it reduces or masks side channel
   emissions. MAYBE THIS REQUIRES RESEARCH.
   There are serious vulnerabilities, and everyone looks the other way. It
   is a great mystery.
   Somehow there is demand for hardware random number generators when you
   could fit an antenna to the microphone jack and pick up low frequency
   cosmic background radiation. Or even higher frequencies, wifi requires
   error correction because of imperfections within the circuitry and
   echoes from walls requiring full knowledge of the device's placement
   and design.
   In the end, the most amazing thing is that every purported benefit is
   really a hindrance, and real beneficial things without secret problems
   are ignored.
   No really, look for every touted benefit that seems to provide marginal
   benefit over a simpler solution, and it is really an elaborate
   backdoor. x86 is designed for the unlikely scenario that a computer
   only needs a few dozen threads.
   P.S. Buy iPhones, not Android, because the Apple tax is really the
   price for cybersecurity. In some mystery, carrier-specific forks of
   Android should really use a subset of apps, unique sprites, and unique
   bootloader screens. If Google cared about cybersecurity, they would bar
   outdated phones from being sold that can access Google Play. Android
   4.4 devices are STILL BEING SOLD.
   Ideally when people buy products, money goes towards a trust for long
   term maintenance of them. Like cemeteries. A properly designed product
   would be supported for a long time.
   Purism's products seem to be from an irrational design basis that the
   GPL will cure everything.