Trello grew because it was very KISS. The features were so-so but everyone could use it easily. Atlassian just purchased the bottom segment of the project market, the segment that would never use JIRA in a million years because of it's complexity.
Yep, they're consolidating the market and becoming a bigger monopoly. At almost every company, and especially the large ones, JIRA is the "tool" that is used.
I keep wondering whatever happened to all the other tools out there because everyone in corporate life has consolidated on this big complex tool. Maybe all other project and task management tools were too open/open source? Didn't feel enterprise-y enough for managers?
The basic breakdown of disruption was okay for someone unfamiliar with the idea, but the writing was horrible. It was littered with 1-3 sentence "paragraphs", bold text and exclamation points. And sentence fragments. And often a combination of multiple irritants!
To be honest it felt like it was written for people who aren't really comfortable with reading anything longer than a few sentences at a time.