In no particular order
- Meetings
- Reading papers
- Understanding legacy code
- Reading internal news
- Ad hoc chats with coworkers
- Writing docs
- Editing configs
- Thinking about solutions
- Slacking off
- Analyzing results
- Testing code
- Reviewing PRs
- Understanding others' ongoing projects
AI can do everything you listed except chats with coworkers and slacking off.
I just don't think you've utilized the most recent versions of codex or claude.