Focus, yes. Also, listen.
If your customers are consistently saying, "this is nice, but what I really need is..." that's a massive sign that you should refocus your product to address their pain.
If your customers are consistently saying, "this is nice, but what I really need is..." that's a massive sign that you should refocus your product to address their pain.
It's common for a basic product to satisfy many customers, who then all have slightly different needs for additional features. Taken to extreme, you end up with Microsoft Word.
On the other hand, you have Spolsky's claim that the #1 way they increase sales is by adding new features.
Finding the right balance is difficult, so it's easy to say that it's a common cause for loss of focus by entrepreneurs.