And I'd add that for every animal supposedly wounded and not recovered because of an "underpowered" cartridge there's another one that's been lost to an idiot thinking that his powerful magnum somehow makes him a good shot at distance or atones for bad shot placement.
Now I agree with the poster you've replied to up to a point (though foot pounds of energy never killed anything, that 1500 number is pulled out of a hat and nothing more, as much as it is a sensible approach) - these days we're not using a .30-30 (or a .22 for that matter, had a great great uncle died before
I was born that killed all manner of big game animals with a .22 rimfire and a .22 hornet during the 30s and 40s when times were very tough and kids gotta eat) because it's all we have and we'll starve if we don't kill. So I do agree that if we can use a more reliably ethical fast killing cartridge why wouldn't we? Many guides and outfitters suggest the 270 as a sensible starting point for serious elk and moose guns, this is based on experience and observation, and seems wise.
But that being said, the false confidence and unethical shots taken by folks with big magnums they bought just for a specific hunt that they can't shoot well, are intimidated by, or plainly do not understand ballistics about (for example the number of people over the years that have suggested a .30-30 is on the light side but then go on and talk about shooting big game with a .300 rum at 700+ yards….DO THE MATH!!!!!
) is no less a problem.
There really still are people that believe that if it's got enough energy, or if it's going at a magical velocity, or if it retains all its weight, or if it retains none of its weight and does an energy dump, or if it generates "hydraulic/hydrostatic/hydononsense" shock, etc…. It will somehow magically kill quickly even with poor shot placement. A shooter with a .30-30 that knows the rifle, the cartridge, and their own ability is way less likely to wound a majestic creature senselessly than a shooter that bought a rifle with more recoil than they're used to and imagines it's a death ray because of the size of the cartridge haha.