The tragedy of it all is that its style sheet functions are fairly powerful, if buggy, but I've never found a way to convince normal users to use it in a way that doesn't introduce a ton of errors. It has three major issues for making document managers pull their hair out: formatting marks are turned off by default so users can't tell when they're doing something weird, ad hoc styles are the in-your-face way to format text, and it gleefully adds any styles pasted in from the web or other documents. I've lost track of the number of documents I've been given to fix because they started apply formatting incorrectly, and finding that the document had dozens of styles all ad hoced to look similar, line breaks mixed with paragraph returns, and tabs mixed with clusters of spaces... none of which any of the users ever noticed because they had their formatting turned off. The only solution is often to completely strip out all formatting, paste into a clean document, and hope when given back the users won't immediately mess it all up again.
So then, inevitably, I finally convince my managers to switch to something like InDesign which was more appropriate to what they wanted to do in the first place... and anyone immediately outside the team starts bitching that they can't get a .doc version of a document instead of a .pdf.
Which is to say, even for the business case documents that it's best tuned for, Word is generally heavily overdesigned for what most users need, introducing tons of problems that they might not even understand other than that they sometimes have to waste hours fighting with a document to get it to look right.
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