I have read a little about bumper hight and pedestrian impact zones, wish I knew more about this subject.. BTW what do you drive?
The thing is being able to see. With a hood height over 4 feet above the pavement the sightlines for small children, people in mobility assistance devices, and even folks on some kinds of bicycle are extremely difficult to see over a flat, tall hood. There's no practical reason for a tall, flat grille. It doesn't do much for actual passenger safety, and in the EU such tall, vertical impediments to driver vision are not legal (though flatter, taller grilles on
passenger cars started with EU regulations, this isn't of the same cloth).
I'm a fan of the European idea of crash
avoidance: making it so it's less possible to have a crash. And I'm not a huge fan of have technology be the ultimate decider of what's considered an "acceptable" impact. The driver needs to be aware of the fact that they're in control of multiple tons of metal and plastic, traveling with momentum, and that being in charge of such a weapon (and it
is a weapon) assumes a great level of responsibility for its use.
Just my $0.02 as a person who mostly rides a bicycle and walks for transportation in his day-to-day existence. Yes, cars
are necessary for many of life's needs and desires. But super huge cars? Not necessarily - and typically not for everyday use.
I drive an Audi A4 sedan. I also live in a dense urban area, where anything larger than, say, a Subaru Forester or Nissan Rogue is too much in terms of size. Street parking is the norm, often in small spaces.
I'm also a fan of only getting as much car as you need, not necessarily getting everything you want. Example: my A4 is small as it's not a wagon, I have a roof box for winter use so I can carry more things as needed. When I replace the A4 (which, at 21 years young, is getting to that point) the likely replacement candidate is a Subaru Crosstrek with a manual transmission (both personal preference and a handy anti-theft device in modern cities).