But that’s kind of the problem. If it’s only supported in one or two apps, is it really an open format?

For example, I use Libre Office on my laptop. However the printer driver for my printer is no longer supported and Microsoft keeps installing a broken one over the one that works. I can no longer reliably print from my laptop.

But printing from my iPhone has been flawless for years. But if I try to look up how to edit and print open document format on my iPhone, the answer is “Microsoft Word”. How is the “open” format not supported, and why do I need to switch to a proprietary format?