I strongly agree. Most of the time people base their first impressions on how an app looks, not what it does. That makes it pretty hard to be successful if you

I strongly agree. Most of the time people base their first impressions on how an app looks, not what it does. That makes it pretty hard to be successful if you only know how to tweak the latter. I would also argue that being able to design workflows is very important. If your app is simple to use and well thought out it's going to be much more sticky...