I'm puzzled what you want in the end: - DRM supported -> not open enough - DRM disabled because you reflashed a custom image -> bad as well Supporting DRM doesn't make anything less open - it means you have a feature you can use if you want. If you don't want to use the drm feature, live like you lived with N900. Trust me, having DRM / trusted platform enabler will mean more software to be available for the device, with zero damage to open ecosystem. Unless you count pirates as part of open ecosystem...
It would be nice if it were that way, but that is not how DRM works. It's not a "feature" that you can just ignore or use at your will. In most cases, DRM needs to "infect" the whole system and requires a closed platform. If the platform is open, one can snoop, circumvent or override the "protection", so in order for DRM to work, the control of the platform must be taken from the user. I remember when Vista first came out and it would degrade DVD playback quality on early HDTVs and monitors, because they were "not trusted". That was an early warning of what DRM is poised to do for those that keep ignoring its pervasive nature. "Trusted Platform" affects the open ecosystem because it takes control from the user. The manufacturer (or an assignee thereof) has ultimate control of your device and can prevent you from using it in ways they do not approve of. A corporation, not YOU, has control over what software can be made and installed on your device. Nuff said.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...