I never said .doc documents were being passed around to everyone in a company, however it is common for them to be past between relatively significant numbers of people, for editing, proofing etc which makes pages impractical to use. Your workplace doesn't represent all work places!
The other problem with pages (and iWork in general) is the constant file format changes.. Its now changed twice since 2013, and it had changed before that. You can't easily just open an old file in some sort of compatibility mode (like you can in office with a .doc) and know that if you send as a .doc anyone will be able to open it with pretty much any version of office from the last 15 or more years.
Where as with Pages, you've got all these different versions (and different people don't update, especially in corporate environments where people won't update to the latest version of OSX for a period of time) and since usually iWork requires the latest OSX, it makes updating impossible unless everyone is on the latest version of OSX. So then you've got people who can only open iWork 09 files, some who can only open iWork 2013-2015 files, some who can open all files etc, and while you can export an older file, you can't just set it to standardly work in some sort of compatibility mode, you've got to export it which is annoying.
Again I dislike Office and I use iWork but there are a lot of pitfalls with it.