Even some of the ones that seem ridiculous by modern standards, like “anything a menstruating woman sits on is unclean.” There were no pads or tampons. You bet your ass it was unclean. Whatever rudimentary menstruation containment they’d come up with at that point, it likely leaked and/or easily disarranged itself. You know what you get in a desert climate, living in a tent, with the smell of fresh blood? Predators. like, forget the whole “blood carries disease” (and it did, blood parasites were so common at the time that the Egyptians considered bleeding from the anus normal), you can’t get to the Promised Land if you died of acute wolves. So how to make the items ritually clean and usable again? Fucking wash them. That’s it. They had to be washed.
Or like the “don’t mix fibers of two kinds.” I saw an incredible discussion here on Tumblr about that. Basically, the fibers that were available to the Israelites were linen (lightweight fabric, good for hot weather) and wool (heavy, good for cold weather and rain). Do you know what happens when you try to mix these? You get an unusable mess that will not contain the properties of either fabric. It’s a disaster--a waste of time, labor, and fiber. And if you try to full the fabric (which means a process by which you clean, thicken, and strengthen natural fabrics), the fibers won’t full the same. It’s just bad all around.
Or even, “every seventh year, let your land lie fallow and don’t grow anything.” You know what happens in that year? All the old stalks, leaves, etc. fucking rot. They, in modern lingo, compost. They refresh the soil. They keep you from stripping all the nutrients, so you can continue to grow things. And you can continue to drop as much cowshit as you want on that field to make it nice and fertilize-y during that year. You just can’t grow anything. By the time you come back to planting you’re going to have a nutrient-rich field that’s absolutely raring to provide you with high-quality produce.
This is one of my big beefs with the Orthodox. Ask an Orthodox person about halacha and they’ll say “it doesn’t matter if it lines up with science, G-d said it therefore we do it.” And I’m like . . . one, that’s completely contradictory to the teaching of Torah (which demands you question), and two, the point is, isn’t it fucking fascinating how G-d’s instruction book is scientifically sound. Like we were being, I don’t know, taken care of.