"I'm unclear" versus "it's unclear to me that"

I believe that in most instances of use, the speaker intends "I am unclear" to have the same meaning as "it is unclear to me," and the speaker uses this phrasing perhaps to be a little kinder to the person whom he/she addresses by way of taking on the burden of the misunderstanding.

However, technically, "I am unclear" means that the speaker is not explaining something in a way that others might easily understand, e.g.,

I am unclear in my presentation about whether the relationship is merely correlational or causal because tests were inconclusive.