Or maybe the explanation was bad to begin with. Over communicating won't turn a bad explanation into a good one. Understanding something doesn't mean you know how to explain it to someone else.
Too true. Explaining things is hard. My gripe is mainly people's tendency to pretend they understand in perpetuity, instead of expressing a modicum of curiosity about it. "What does 'TPS' stand for actually?" As mentioned, explaining things is hard, and I think I'm not alone in needing help identifying gaps in my explanations.
That said, I also understand that there are huge social barriers to admitting a lack of understanding in the tech industry, especially for juniors.