We would really have to be talking about a specific language to discuss properly I think, but there is no need for internal state. There is more advantages as w

We would really have to be talking about a specific language to discuss properly I think, but there is no need for internal state. There is more advantages as well, depending on language, in that one is extensible and one isn't. Some probably see that as a con, but I have done enough work backed into tight corners to know it is better to have it than to hack around something non-extensible.