Seeing the other post here about YouTuber that went downhill and seeing content creators I am familiar with makes me sad. But how about those that still makes great, high quality content?
Haven't seen Summoning Salt mentioned yet. He does great videos on the history of speed running a video game.
An example video would be Super Mario Bros: The Human Limit where the difference between a tool assisted speed run and what a human is capable is discussed. And how Super Mario Bros has an interesting mechanic allowing humans to be imperfect but still able to tie a perfectly executed speed run done using essentially a script of commands.