Pros:
Trello’s biggest plus is it's out of the box simplicity. It is a straight forward tool and easy to work with. You almost don't need an intro, especially if you know how Kanban works.
Trello is essentially a Kanban board, and you need to treat it like one. You can quickly see an overview of how your current project is moving, only if you follow the onboard principles. The best of Trello is to use it as a tool for Kanban; otherwise, you just have a visual board with cards.
Trello facilitates Kanban with ease with different extensions and Power-Ups, but if you start adding rocking busters to it, you lose the magic.
Trello is great when you have a pipeline process. At DistantJob, we use it for our content creation process. We can follow through the writing stages, and when Kanban setup is right, you have a good through output.
Cons:
It gets quite tedious to set things up when you have complicated tasks to deal with. It’s not useful when your projects are too complex. The more complexity you add, the more magic you kill.
If you want to see the more in-depth state of things, you would have to go through each card; you don’t have a dashboard. There is no proper overview of projects.