In fact I think teaspoons are reasonable for those if it's something you'd prepare at home. Faster to measure with a teaspoon than using a scale or measuring cup, I'd think.

I never liked spoon based measurements as the spoon size varies. There’s also the never ending question of level vs heaping.

With those things it doesn't have to be exact. I can imagine how much 6 teaspoons or 2 tablespoons are. But I can't really do anything with 25g without a scale.

I was curious because I sometimes estimate recipe ingredients so I and compared my intuitive notion of a teaspoon and tablespoon to their measured amounts using table salt and found it to be off by a larger margin than I expected.

Different types of salt and sugar have different densities too.

A flat tap is 5 ml isn't it?