I think one of the big problem of Word is that it is routinely used for things it was not designed for and which are still out of Microsoft target.

It's a tool for not too long technical documents, for secretarial work, for basic marketing text, for quick an dirty but decently presented invoices, for writing a resume.

It has never been meant for writing novels, for page setting, for writing hundreds of pages of technical documentation, and yet... it is used for that. Everyday.

Simply because it's available everywhere.