CSV is great, but Excel is more or less the industry standard for "mortals". Of course you can import CSV in Excel, but a lot of end users doesn't know how. Character encoding could also get tricky and Excel handles fields with multiple components poorly (eg. multiple choice with more than one option selected for a given field of one record) when importing from CSV (it breaks up the columns incorrectly) compared to importing into Google Docs, saving as Excel and then Excel displays it perfectly.
This causes so much extra trouble for the end user.