I think probably all people dismiss what is obvious to them as not needing to be said, and for good reason: why overburden a conversation with obvious truths. Though given that we’re all just apes with a superiority complex, we’re probably entirely wrong about what’s obvious or true 🙈
You’ve got the right idea though, PCR is usually necessary before electrophoresis in order to amplify the sample being tested so that it will give a legible result.