Beign locked in is a relative state which one learns from experience. Its open (and unfortunately defacto) standards/protocols and integration which make the world go round.

Linux running on Android or WebOS or UNIX-like on iPhoneOS says little to nothing about compatibility with Maemo. However if you have a game on one mobile platform this could communicate with another using open standards supported in both devices (802.11a/b/g, TCP/IP, and a protocol used over TCP/IP). Ofcourse we haven't discussed the potential of Qt here yet, but that is long term. Will developers realize they could save a lot of time? Time will tell.

Also see it from other point of view. Linux on desktop has little market share. Open standards only used on Linux desktop have on the short term little to not relevance for most end users . Therefore it is difficult to help them understand the relevance.

In other words, if one is locked in and happy with that for one reason or another (work around it, don't even know it) one doesn't care about your stated point. Once the disadvantages of being locked in outbalance the advantages change of perception will occur. For that to realize the end user can be educated but thus far 'it is open source' has on short term not been a fruitful, convincing argument.

Futhermore compatibility layers are very important. WINE with DirectX compatibility layer running on Linux/X11/OpenGL is a great example IMO but its also for x86-32 only.