Éire / Ireland

You're in Europe. If you're cooking an American or British recipe, you'll have to convert things. Same as you would if you were cooking a recipe that's using other measures, though since those aren't likely to be in European languages at all, unless they're much older, I can't imagine the average person trying to.

Volume is plenty helpful, as I said, because you don't really need anything complicated to use it. A vessel with lines on it is about as simple as it gets. Hell, most recipes issuing volume measures don't even need precise measures at all, there's a ton of wiggle room in them.

I'm kinda weirded out that you skipped all the parts about how and why various forms of measure moved into recipes and basically repeated the same complaint, tbh.

A lot of recipes would benefit from being moved to weight rather than volume. And that's regardless of what units are involved. But, they then become something one tier more complicated. A pound of potatoes is more precise than two medium potatoes. But precision doesn't matter with potatoes because you aren't going to waste half a potato to get exactly one pound.

Flour isn't any different until you get into baking, and even then the degree of precision needed isn't what you'd need in a chemistry lab. You can do all kinds of baking just by eyeball; using volume is just more precise, and weight another step more precise.

That's why it doesn't matter than flour is sold by the pound and used by volume or grams. You buy bags of flour and store them so that you have them ready. It's a staple food. If you need to have an unusually large amount by volume, you're going to go buy another bag, or two, or three.

If the recipe uses grams, you use a scale that has gram units. If it's by ounces, that's what you use. If the recipe calls for deciliters, or milliliters, the same just as it would be by cup. Conversions are just part of cooking. It always has been.

Maybe, if you can get every country in the world to start translating their recipes into a standardized recipe language, you could eventually get to where conversion isn't part of it. But it wouldn't be as simple as just doing everything by weight. There's too many ingredients like potatoes or eggs where the unit is the item itself. The waste involved would be absurd.

Seriously, it isn't rocket science, it isn't a chem lab. Grab a conversion chart, have some fun.