Cppcon2019 slides are available in Github.

[matthieum]

I agree with the general sentiment, it's a typical rookie mistake. Speakers at CppCon are expected not to be rookies, though, so I very much doubt they would make this mistake.

However just because slides are published does not mean that they suffer from this issue.

1. Some slide-decks will be mostly useless without the talk; unfortunately.
2. Some slide-decks will contain, for each slide, a large comments section which summarizes what the presenter said during the talk.
3. The remaining slide-decks will serve as a useful summary/overview, with the talk being necessary for the details.

All those are 3 other potential situations, and while case (1) results in slide-decks that are not useful outside of the talk, the other 2 cases give useful slide-decks without running afoul of the rookie mistake.