Persians might actually be a unique dual culture. Whereas others might guess or ask about things, Persians offer absolutely everything and the actual problem then shifts from "what can I ask for" vs "what should I refuse?".

An asker asks for things, absolutely everything, and the giver must choose what they can give.

A guesser must choose what they can ask for, and only ask when they're quite sure it can be given, so the giver has less responsibility for the transfer or service, and most asks can be assumed to be reasonable.

A Persian cannot ask for anything. They must wait for it to be offered, and even then, they must insist that they are quite alright, and that they would rather do without, and only through reciprocal insistence from the giver can they consider whether it would be rude to take them up on the offer.

Presumably, one can judge the giver's underlying intent by the quality of their reciprocal insistence (does it seem like they're just doing the bare minimum of insistence upon their offering, or do they truly wish for me to take them up on it?)

In the Taarof system, an offeree actually has more data, rather than a simpler Asker-scenarion "no", and even more data than the shared values in a Guesser household, this allows for a quick negotiation of values by the immediate and well-practiced cultural norms around the quality of insistence, even for people across different households.