Right. The box wasn't necessary to search, but was an indicator of Google Desktop's success. Furthermore, we can still leverage the dead binary with just a little system hacking: https://www.youtube.com/watch?v=d5ieNv7oelk
I followed search appliance closely when they announced it. It was interesting technically and looked cool, but seemed like a dead end similar to desktop as applications were largely moving off of racks/desktops. I was right about that, but I expected Google to offer a web-based search appliance and they never did beyond custom searches. Algolia fills that opportunity nicely now.