Why is Xavier's keynote better? Simple: He insists on featuring the community effort instead of making a D*H#H show. As s proof, a few slides I was able to take where he features the work of Mattewd, Rafael França, Dylan Thacker-Smith & Richard Schneeman work.
... Xavier Noria continued for almost the whole Keynote thanking everyone who was open to helping him with Zeitwerk because at the end it was a big support for the whole ruby community - not only Rails. Here Sam Saffron, Martin Schurig & Jean Boussier