HOw is having two versions of Basecamp (old and new) simplification?
Also I think Asana is beating Basecamp in terms of having both simplicity and power, although I would say that the Basecamp UI is more simple than Asana, Asana is a lot faster and a lot more powerful and Asana is free for up to 15 users. I think Asana will take a lot of business away from Basecamp over the long term.
Having said that, in our business we use Jira, Asana and Basecamp (part of the reason for using all 3 is that we integrate our product with them). We keep Baecamp as a central repository of information and for that purpose Asana is not really as well suited.
For task management, Asana is way better than Basecamp.