I think it's a different sort of rabbit hole. If you lean in to the graph-based organization and try to build a mind-map, it can get pretty deep. I had to restrain myself when I found organizing every market segment and competitor in my industry, or every technical topic I'd ever come across.

In Notion I think the rabbit hole is overly-complicated documents. In Obsidian it's going crazy with the graph and volume. That and finding the optimal set of plugins.