Whodawhut now? Tell that to the Conquistadors and the people they killed.
Yeah, the conquistadors and other early explorers who lived in fear of native bows (which easily could penetrate "bullet-proof" armor, or a decently thick tree-trunk,) and Macahuitils, which were perfectly capable of killing a man or horse.
As for the Conquistadors, they generally formed an elite corps, or the core of whatever army they were leading at the time, with their cavalry being a major factor. Even then, successful conquistadors were generally a mix of Lucky, ruthless, and devious bastards with a talent for diplomacy, or they resorted to overwhelming force.
Narváez' expeditions to Mexico and Florida illustrate what happened to the would-be conquistadors who weren't the sort of man Cortez and Pizarro were, and relied purely on their assumed overwhelming qualitative superiority.
Metal is easier to shape into very killy designs and easier to keep sharp,
Depends on what's handy. But flint and obsidian are easy to sharpen, and stay very sharp. Admittedly flint is brittle, but that doesn't matter as much when you're hitting someone straight on with it, and it's protected from shocks along it's weaker axes by a material like Oak or Ironwood.
and in some ways more durable-a broken or bent sword can be reshaped or reforged, but obsidian can shatter.
And when that little bit of obsidian in your macahuitl shatters, you pull it out and replace it with a new piece. It takes maybe an hour plus knapping, tops.
Getting slashed by a sword is much more likely to kill you than being hit by a rock.
Yeah, look at an actual Macahutil, and then say that.
Both of these probably weigh a good five to ten pounds each, depending on the size and type of wood used. The Average Spada da Lato weighs about a half to a quarter of that. This is one of those places where kinetic energy is the deciding factor.
Metal is much, much easier to work though.
That depends. from personal experience, I can definitely say Stone knapping is pretty easy once you know what you're doing.
Metalworking requires a lot more infrastructure and materials, plus the specific ores, which aren't really as close to the surface in the Americas. Also, it takes a hell of a lot of wood to burn as fuel, either straight for bronze production, or to make charcoal. In the most advanced parts of the Americas that wasn't really an option without the means of hauling several tons of wood over a mountain range or two, or from the coast.
Working precious metals and making Alloys like Tumbaga OTOH was worth enough to make procuring the smaller quantities of wood needed to do it practical.