When you have the size and money of Atlassian, that excuse is pathetic. Yeah we have 3000 Developers (or whatever) and we don't have the resources to do good UI design, refactoring away from poor performance etc. I always thought that these companies were the ones who invented "how to do good web apps", but it seems like function over everything and even the functionality is poorly implemented in some cases.
How can anyone think that a simple app that downloads 24MB over 900 connections is OK. What the heck?