There are people in the world that must use Microsoft products to ensure 100% compatibility when exchanging documents with clients. I happen to be one of those people, fortunately-unfortunately. I cannot use Apple products and export in DOCX format and send it over. Clients sometimes want some things in a certain way that must reflect as is when they open those documents in their Microsoft apps. Nothing I can do in that regard.. except to swallow the cost and account for it in my prices I charge them.
We know you love iWork, and I agree it is great, but please understand for once and hopefully for all times that iWork is best for environs that do not include Microsoft apps but only Apple products. I am not going to say it is great for personal use and not for professional use, because if my client is a Mac environment, I would do much better to send the client a Pages/ Numbers/ Keynote document than a DOCX/ XLSX/ PPTX Microsoft document. And that would be a professional exchange, so not saying iWork is not for professional use.
But, you have to understand and admit, bringing the greatness of iWork into the discussion every time office productivity software is being discussed is like bringing a butter knife to a gunfight, simply because of the fact that a majority of the world uses Microsoft apps at/ for work. When that situation changes, the tools we use will change.
I will give you an example here. At iWork's peak in around 2009, it was so good with interoperability for my use that I was working in iWork and converting and sending out to clients and they never had any issues. My full professional needs were being met with iWork. I cannot say that today, because Apple decided to convert iWork into apps for children, so to speak. The power that was on tap has just been missing ever since they overhauled the apps.
So, point is, if 90% of your recipients use a Mac, you can get away with iWork and think why are others not using it.. but an obscene number of businesses in the world work with Microsoft apps and, therefore, anyone working with those businesses must also work using Microsoft apps, whether desired or not.