Only on HN can people question the existence of an app which has 50M users. Trello might not be this month's flavor but I'll be damned if it's not one of the most useful planning tools out there.
I don't know how Trello has 50M users, and how so many people and companies can use it for project management. For anything more than a single board, I find it terribly lacking in functionality. Can't even see all your cards across boards without scrolling 50 times.
Well then they’re something wrong with you and your understanding of what people want in software. Can you link an app that you’ve made that people actually use?