Leaving Notion, Codebase as a Wiki?

I was talking to some friends (2 founders, old coworkers of mine) where I learned they check in EVERYTHING into their codebase. Not just plan.md files or implementation details, but investor_meeting.md, user_feedback.md, growth_strategy.md, TODOs.md, and more

They do this because even though they could just use these AI-powered SaaS productivity suites like Notion, Linear, etc,. it's way way simpler to just dump stuff into the codebase, let Git handle the collaboration aspect, and let Opus/Sonnet + Claude Code retrieve info and manage it.

this got me thinking, highly collaborative teams are spending more and more of their work day in AI coding tools. i'd bet a lot of them have custom approaches that let them collaborate even on non-coding stuff.

- Some people are still all-in on Granola, Notion, Linear MCP etc. - Others like wrangling .md files in git - I have friends that run a script that syncs local memory files to their teammates whenever their CC edits them locally. - And still others hate this idea and want to use the established players

this was really interesting to me, so i thought i'd ask here -- if you're deep in AI coding land, how do you collaborate w/ your team? do you have hacks and custom workflows? what kind of team are you? Alternatively -- if you don't use these tools like this and use them just for projects/code -- how do you work with others?