Not to mention that for cooking our way is much more logical.
A cup is 8 oz which converts down into a half (4oz) quarter (2oz) eighth (1 oz) which is two tablespoons and the tablespoon which is three teaspoons.
And then you go up to a pint which is two cups, a quart which is two pints or a gallon which is four quarts
Up or down things move in mostly even numbers which makes it easy to expand or shrink the recipe mentally.
And if you are doing emergency cooking without measuring cups and spoons then the standard teacup and spoon works very well.
Now with the liter you have have a half of a liter (500 gm) the quarter of a liter (250gm) and the eighth of a liter (125gm) but at that point any smaller you began to get into fractions.
Nothing divides evenly anymore.
And what do you do without a scale or a measuring cup? Can you "eyeball" 512 grams of flour? Yes, but it is much harder then when it is 4 cups.
2 cups = 1 pint
2 pints = 1 quart
2 quarts = 1 pottle
2 pottles = 1 gallon
2 gallons = 1 peck
2 pecks = 1 pail (or kenning)
2 pail = 1 bushel
2 bushels = 1 strike
2 strikes = 1 coomb
2 coombs = 1 cask
2 casks = 1 barrel, unless it’s beer, wine, oil, and depending on whether it’s in the US or the UK. From there a perfectly orderly system pretty much segues into the twilight zone...