Benefits of In Depth Interviews for Market Research

At The Research Bunker Blog, they recently posted nine reasons why in-depth interviews for market research are better than focus groups.

They are:
-Better rapport.
-Better sampling.
-Useful with Difficult Recruiting.
-Fewer distractions.
-Faster and cheaper.
-More productive.
-Deeper Insights.
-More flexible.
-Faster adaptation.

To find out their reasoning, visit the post. Do you agree with the reasons above? Do you frequently do in-depth interviews? What benefits do you find when discussing a topic with a person one on one instead of in a group?