Earlier quoted context omitted.
How dare they make their systems work so well together and easy to use.
That's not really what lock-in means. An example of lock-in is making a conscious decision not to port iMessage to Android, specifically because it would make it easier for iPhone users to move to Android[0]. Making Apple products work well with other Apple products isn't lock-in. Purposefully making Apple products work worse with other systems, phrased within the company as a way to punish users who switch, is the k…
Cool. iMessage works perfectly well with SMS, which is the only true open messaging standard, and therefore will work with anything else that interoperates with SMS. Job done.