Any frontend guy will tell you that content is very important to be able to do their thing. You cannot properly structure content display and style it without having material to play with. And there is nothing more tedious than creating fake content on-the-fly to do the job. It will end up being destroyed, and you'd have to do it again because a new field was created. How about fixturising your content and keep on iterating it?
Drupal development as a team is tough: finding a balance between code and configuration saved in the database is one of the hardest challenges to overcome. When working in a team, it is even more important to control the development cycle, having different people work on different features at the same time, and automate as much as possible of the repetitive tasks you're really to do.