Communication hopes to clarify a complex matter in the simplest terms.
Explanation, on the other hand, aims to complicate a simple matter by using the most complex words.
Whether or not people can understand is not important, for those who truly want to explain the problem, what matters is whether they can complicate a simple issue with complex means.
That is the significance and crux of the problem.
People seldom remember what they just said, as they are usually thinking about the future and forget about the past.
This can be seen as human instinct within a short period.
Everyone, driven by instinct, makes their own behavioural choices and judgments.
It's like the thing everyone knows: Every action has a purpose. People act to achieve their objectives, not to resolve issues blindly.
Thus, people tend to overlook what they just did, focusing more on their future goals.