I suppose the heavy infrastructure spending is intended as Google is competing in the AI space, but it'll be interesting to look back in a few years to see if this pays off.

Yes, and what's scary is that I can easily imagine HR departments loving these tools and using them at scale.

this looks incredibly useful! I've also run into similar problems with code review and been building similar tooling with the same idea (reconstructing the changes into entities, and finding focal/important changes), but haven't gone as far as this.