Never dawned on me ever either. If you read my post. I was stopped and made a mistake in assuming I was in Park.
For all the folks who think confirming Park position before ignition off is a novel solution... Thanks Captain obvious.
Logically, the same question would apply: If in Drive and a keyed ignition switch is rotated to Off, what happens.
In all the vehicles I've owned, the engine shuts down, the vehicle remains in Drive and all powered components cease to function. Replacing the keyed ignition switch with a Start/Stop button won't change the equation.
So, I was wondering whether the NHTSA would conclude the same and simply send you a boilerplate letter in response basically concluding that no emergent or viable safety concern(s) had been raised.
Given the advent of the ECM/PCM and its variants (depending on OEM) could automobile manufacturers encode logic and mechanical/functional lockout for engine shutdown
only when in Park? Sure, absolutely they could. Will the Federal Government require it by mandate? Right now, that's probably not going to happen unless an untold number of people start complaining to the government that they feared risk of serious injury to themselves and/or others because they inadvertently manage to always hit the Start/Stop button while their vehicle is in Drive, causing an unsafe condition as a direct result.
I was just thinking about this from the standpoint of what happens when the NHTSA opens the letter and reads it. I find the question and interesting one.
I would rather the NHTSA and OEMs alike, go to work on agreeing to Anti-Tailgating Laws being coupled to Anti-Tailgating technology. That would do a lot to save actual lives. Something like making the radar based distance control feature permanent, non-retractable and made a regulatory requirement. It would push traffic jams to the streets, deconflict our freeways and eradicate all collisions caused by people follow to closely. I'm all for sending that letter!