> ...as a defence mechanism, people embbed complex (almost impossible to understand during the talk) information in their slides... Yes, this happens a lot, an

> ...as a defence mechanism, people embbed complex (almost impossible to understand during the talk) information in their slides... Yes, this happens a lot, and it has the effect of alienating those who actually need to hear the talk and coming off as pandering or cloying to those that already know the material. One thing I suggest to folks, if there is some insecurity about not covering "everything", is to make some slides on detailed sub-topics that aren't included in the main talk but are intended to be used when/if there's a follow-up question. If the speaker is careful, they can even "bait" their talk to implicitly suggest follow-up questions for which a detailed auxiliary slide has been prepared.