[triceratops]

Oh yeah it's not great either I agree. But the use case for Google Docs is somewhat different in my mind. It's good for collaboration and discussion, rather than a source of truth to describe "how things are right now". It's annoying if you can't find a particular document immediately but it's not the end of the world. Discussion on a Google Doc will happen for a few weeks or a quarter, then die down and the doc will seldom be looked at again. You might link to it from tricky parts of your codebase but it's not essential to a high-level understanding.

Confluence and other wiki systems are clearly meant for longer-lived documentation and canonical information. You should link from or attach your working documents (spreadsheets, slide decks etc) to your wiki documentation for people to discover why certain decisions were taken. But if the wiki's discoverability is poor or it's not well-maintained or regularly reviewed, it's basically useless.