When other nation states are trying to blockade them, it matters. Iran's stability required interaction with markets, otherwise it's one key asset, oil, is useless. It needs money to function like any other government. When cut off from cash or equivalents, it begins to suffer. This is an age-old issue for Iran, otherwise known as "Dutch Disease."

https://www.imf.org/en/publications/fandd/issues/series/back-to-basics/dutch-disease