If someone says "I go to the theater all the time" we know implicitly that this means "a lot" and is not meant to claim that literally "For all times t, I am going to the theater at t." Similarly if we say that American actors are bad at doing British accents, we don't mean that there is not an American actor who can do a convincing British accent. We mean something like: The rate of American actors who can do British accents is low relative to some standard.
Is there a linguistics concept for these sorts of phrases which are stated everywhere on a domain (i.e. if literally translated into formal logic, would use the "for all" quantifier) but context is understood by all competent speakers to communicate a statement about a rate taken over the domain?
The topic feels like it's in the ballpark of Gricean maxims but isn't any one of them.