Why do you hate Trello?

I don't because it's pretty amazing. You get a super easy and flexible planning tool for free. If it has a drawback it is the lack of a calendar that gives you an overview of all pending dates.

Can you provide more context? Are you trying to enhance Trello? Are you building a Trello competitor? Just curiosity? An informal user case analysis?

What makes you think I hate Trello?