How do you leave when your friends, family and coworkers are all on iMessage and refuse to use anything cross platform? This literally affects people's professional relationships and close personal connections.
No my friend, Apple has perfected lock-in and turned it into an art. Just because it doesn't affect you doesn't mean it's not an issue.
Their entire business model has been to focus on systems that lock people in and exclude people who are out. None of this is done for security or as a means for the best possible customer experience. It's done for the sole purpose of forcing income they couldn't achieve with innovation alone. I've heard so many tech reviewers and even my own personal friends who say they would love to switch if only to try something else. They say they'd switch today if their friends, family and coworkers wouldn't get mad at them. Apples only real innovation over the past ten years has been built in social pressure.
Think of any invasive streaming devices in your house. Samsung, Google Chromecast, ATV, LG etc. Roku is by far the worst.
Hearing people screaming from the local amusement park