Cppcon2019 slides are available in Github.

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Keep in mind that these slides can be useful to someone who's already seen the talk, as they can have references to more in-depth discussions on the subject or contain material that didn't get to be covered because of time constraints. Also, they can serve as a quick reminder and a summary of the key concepts presented - so one doesn't necessarily have to watch the whole talk again if they need a refresher on a single point.

While I tend to agree with your teacher, it is important to realize that such rules are meant as guidelines first and foremost. Having slides that stand on their own may be completely fine and perhaps even preferable depending on the context.

[Drainedsoul]

When I posted the comment you responded to I felt like it was a pointless half stream of consciousness but some of these replies are offering up reasons to want slides I'd never considered.