First thing I noticed is that the UI looks exactly like Linear. Have seen more companies copy the same UI but not sure if it was actually Linear that started it.
1. Slack introduces "sidebar" concept
2. Notion takes it a step further
3. Everyone starts doing sidebars, including Linear
We took inspiration from Linear's 'search button in sidebar' and 'profile pic in sidebar', which I think were maybe their unique contributions to the tradition :)