Re: Lost credibility here for me:
You are trying to confuse "open" with "open source" here. They aren't quite the same thing.
DOS and Android represent platforms that can be implemented by multiple vendors. So do DVD and BluRay. Either of those give rise to a more diverse market that is capable of addressing a wider range of user requirements including price and features.
Apple is a one trick poiny. They are the proverbial Model-T. That Model-T might be great for one user but suck for the next. Apple has no interest to adapting to different types of customers and are in fact actively hostile to what you might describe as "heretics".