Few of OOXML's Flaws Have Been Addressed
I Don't Believe in Imaginary Property writes "IBM's Rob Weir has done a study on how many flaws were addressed by the OOXML Ballot Resolution Meeting. So far, using a random sampling technique, he has yet to find a flaw that was addressed, making the upper bound a paltry 1.5%. Even so, he's found a number of new flaws, including a security vulnerability: OOXML stores passwords in database connection strings in plain text. At least there were no mistakes on five of the first twenty five random pages he reviewed."
Because people actually do work with Office Suites, and they are an integral part of the workflow and ecosystem of significant companies IT.
For example, a spreadsheet is often the favored client for an OLAP system, and complex spreadsheets will get reused a lot, so connection strings may be part of the overall "application" that the document has become.
People like me and (probably) you tend to use documents as just that: documents. But in the big boy's world, they're far more important than that.