[IanCal]

> Said every software developer ever about every bug tracking/ticketing system ever.

Trello is not a pain for me to use. It would be for others, with different needs, but it's perfect for me.

> Until you need to do X, and we need to track Y, and Z needs to sign off before ...

For many people these don't necessarily get in the way. I've been using trello for a few years on some projects from start to launch, and a winding down of development. It doesn't get in my way, and the lack of features hasn't caused problems.

Sure, we could have gone with Jira just in case things got massively more complicated, but we were easily able to deal with the odd edge case by talking to each other, assigning cards or putting notes on them.