it cannot be beyond us
It isn't; but your ipdod/transponder gizmo, is a couple of hundred Euros. Something similar, suitably tested, certified and installed for an "aviation application" would undoubtably run to a couple of thousand.
I can't see too many aviators, even the most safety conscious ones, being prepared to pay that sort of money for a device installed to record any event that every pilot actively avoids.
If it could be done for 2-300Euro, then I am sure some civic minded pilots would install them. Having said that, even a handheld GPS does record basic track/speed/height info.
btw - excellent piece by Mr Lecomber. I don't always like the sometimes blunt way he puts things but he does talk a lot of sense.