Agreed. Just finished watching this. It's definitely worth spending an hour of your morning on listening to what these two giants (mostly Kay) have to say.
I love his work, and the ones that worked with him.
After learning Smalltalk, Oberon and Modula-3, I started a journey into the world of Xerox PARC and their influences into ETHZ and DEC research labs and became amazed how computing could have looked like already by the mid-90's.
To the point using UNIX stopped being fun, I wanted one of those environments, not a PDP-11 replica.