Productivity software should be opinionated. It is the only way the product can truly do the heavy lifting for you. Flexible software lets everyone invent their own ways of working.
Aim for clarity
Don't invent terms if possible. They can confuse and have different meanings in different teams.
Simple first, then powerful
Tools should be simple to get started with and grow more powerful over time.
Say no to chores
Our tools should not make us their maintainers. We should throw away or automate the chores so you can focus on the more important work.