I've always thought of a machete as sharpened sheet metal. Once you get into adding primary bevels and such, you cross into a bush knife. I have one I still need to get from the heat treater. It's S7 1/8" thick, 12" blade, 2" wide with a 10 degree per side bevel, but no primary bevel. I may decide to add one later, but at that point I don't consider it a machete anymore. I don't think there is a hard and true definition, but that's how I keep them separate in my mind.
52100 would likely work fine for a machete. 1095 has worked for decades. I find Cold Steel's 1055 is quite good, but sometimes you have to go with what you got. I've considered O1 for machetes, just because it has a better range of available thickness than just about anything else. If you're heat treating yourself, 52100 can come out of the quench screaming hard, so temper appropriately.