It's not AirPods being closed that's unfair. Apple should be able to sell first party tech that only works with their own products.
What's unfair is Apple locking everyone else out. Not allowing or documenting for third parties to use the same APIs to enable something like automatic device switching in third party bluetooth headphones is the unfair part.
Same goes for the watch. That the Apple Watch only works with iPhone isn't the problem. The problem is no other third party is able to make a smartwatch that competes on an level playing field with the Apple Watch on Apple Devices, because Apple locks them out.
lock-out is the unfair problem.
Or am I missing something that distinguishes between these two in your view?
Lock-out is Apple preventing third parties from making accessories that can match the first party ones in feature parity and seamlessness.
Apple Watch only working with iPhones=lock-in
No third party watch being allowed to use the same APIs the Apple Watch does or not being allowed to access iMessage, Apple Pay, etc = lock-out.
It's the same thing.
If i offer to bring you fresh breakfast in the morning but not offer the service to other apartments down the street -> „lock in“
If i do not allow you to get your breakfast (of equal quality)elsewhere -> „lock out“