I watch a lot of Grady's videos and there's a comment I've always wanted to make but I don't leave comments on YouTube. I'm going to leave that comment here: it would be great if he spent more time going over the models that he builds and really showing what they're representing. Show it from different angles, show it in slow motion; really explain what's happening and what we're seeing. Note: I haven't watched this particular video yet.

He clearly spends a lot of time building high quality small-scale versions of things to show how they work, but more often than not he just shows those things while the voiceover isn't actually talking about what's being shown. Or when he is talking about the thing being shown, it's a very brief comment and then he moves on.

I love his videos, but I very often finish them and think "I could have learned more if he spent some more time explaining in detail what's happening with the model, and replaying some component of it several times over as he explains it in more detail."