Very transparent every step of the way.
My take on the coding assignment is biased as I didn't get pass that stage. That being said, I think coding assignment style of hiring is a bit outdated and in my case lead to misunderstanding.
As someone with 7+ years in the industry doing that job, I can't imagine someone would need to take care about every single little detail in the example that you're supposed to prepare. My expectation is that I provide the groundwork, we discuss ideas/improvements, I rationalize why I decided to do something that way, suggest what I would do differently or how I would make it more complete in a production context.
Tip for anyone wanting to go through this stage, treat this assignment as a university assignment where you will get deducted points for everything, because that's what it is.