[newaccount74]

I would say it really depends. Some times exact quantities are necessary, some times they aren't.

I hate that almost no recipe specifies salt in grams. How much salt fits in half a teaspoon is pretty arbitrary since it strongly depends on the type of salt. For many dishes it doesn't matter, since you just salt according to taste. But if you are making meatloaf, getting the amount of salt right is essential, and you can't really taste it unless you like tasting raw meat, so an amount in gram would be appreciated.