Yes, your head would hit the overhead bin after 4 inches. Unfortunately, your body would do that inertia thing and continue, folding you tightly somewhere along your neck.
This has happened, not just during crashes but far more often with turbulences.
Regarding economy class: this is simply the result of people‘s preferences, as expressed by their buying choices. With all the complaints you can hear and read, you’d think those exit seats or economy+ tickets would sell like fresh bread. But every time I check in online, even when most seats are gone, most of the exit seats (about twice the leg room for 20$ extra) are still available.
> Regarding economy class: this is simply the result of people‘s preferences, as expressed by their buying choices
If you take something away first, then nobody can buy it, you can then say "look, nobody's buying it!".
For example: for the past 5-6 years EU airlines have made intra-europe business class much more like economy class. BA used to have 34" pitch in short-haul business. That went I think 3 years ago. But I'd be willing to pay up to £500 for that now. Can I buy it? No - the majority airlines have done the same.
It's now very easy for BA/Lufthansa/Air France/Iberia etc to say "that's what our customers wanted" because you can't now pay for it even if you want it.
The comment you’re replying to has an example of a universally available option for more room that few people actually take, so I really don’t think your explanation works.
This has happened, not just during crashes but far more often with turbulences.
Regarding economy class: this is simply the result of people‘s preferences, as expressed by their buying choices. With all the complaints you can hear and read, you’d think those exit seats or economy+ tickets would sell like fresh bread. But every time I check in online, even when most seats are gone, most of the exit seats (about twice the leg room for 20$ extra) are still available.