It just seems as if people won’t think twice about taking a 450g total weight arrow with a standard broadhead and sending it at an elk 50 yards away, but we start talking about African game and all the sudden we need to fully redo our setup to hunt impalas and thinner game like kudu at 20 yards.
IMO the cost of the hunt or animal shouldn’t be the deciding factor on what arrow you choose to use. The decision should be made upon the ability to make an ethical harvest. So it is equally as big of deal in Africa or your local public spot.
With regards to when the shot doesn’t go right. It seem that the most common issue with shot placement is hitting too far back or too high. You are probably more likely to recover animals hit with a 400gn arrow and a G5 Mega Meat than you are with a 700 gn arrow with an iron will on the end. Those situations benefit more from a larger wound channel than more penetration.
If you want some decent entertainment and an representation of bad penetration check this out. There is a youtube channel of an excellent african outfitter adn sponsor here, Driess Vissers safaris. They have 12+ hours of real videos showing proper shot placement on animals of all species. That's the cool part.
The not cool part is the embarrassing ignorance and incompetence of the featured bow hutners. My nine year old was laughing at these clowns on the video struggling to draw their 70-80lb bows that were rigged for speed shooting their slick tricks, their rage, their montecs, and the damned things would bounce off the animals. SO so many animals would have 4" of arrow stuck in clear as day in the slow-mo video. I pity the outfitter and I feel shame as a bow hunter.
Best way to kill an animal with a bow is to get a pass through. Best way to get a pass through is to have a broadhead that doesn't yield to resistance (good materials, limited drag, strong steel) and that possesses plenty of momentum to keep the arrow drilling through.
The problem with bowhunters is they rely on experience, not data. You can do everything wrong and have the wrong gear while drawing 70lbs and kill every white tail in America. You apply that broken logic to an animal 4x-30x the size and things go sideways. Data said it would go badly, but past experience misapplied suggested otherwise.