"My understanding is that legal documents are written precisely to be as hard to misinterpret as possible."
Actually it depends on the circumstances. Sometimes you want to be precise and sometimes you want to be ambiguous depending on what you are trying to achieve.
Semi legal example: Let's say you are offering people email accounts with a web hosting service. You can be precise and say "you can have up to a million email accounts" or you can be less precise and say (believe it or not) "unlimited". If you say the latter you can then define imprecisely what you mean by "unlimited". If you specify a number you will box yourselves in. Same with customer support or a host of other things. Precision sometimes works against you. (Corrected I said the opposite before edit.)
Another example. Let's say you have a display of free utensils (plastic like at a fast food restaurant). You can say "take no more than 10 ketchup packs" and you will probably end up getting more waste then if you say nothing. In that case, precision works against you.
Actually it depends on the circumstances. Sometimes you want to be precise and sometimes you want to be ambiguous depending on what you are trying to achieve.
Semi legal example: Let's say you are offering people email accounts with a web hosting service. You can be precise and say "you can have up to a million email accounts" or you can be less precise and say (believe it or not) "unlimited". If you say the latter you can then define imprecisely what you mean by "unlimited". If you specify a number you will box yourselves in. Same with customer support or a host of other things. Precision sometimes works against you. (Corrected I said the opposite before edit.)
Another example. Let's say you have a display of free utensils (plastic like at a fast food restaurant). You can say "take no more than 10 ketchup packs" and you will probably end up getting more waste then if you say nothing. In that case, precision works against you.