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Counter example? I wish Adium would add more features. It's been stagnant for years and the only reason why I'm still using it is because there's nothing better.

For example, MSN file transfers have always been broken. They never managed to fix that before MSN's shutdown.

Google Talk file transfers are similarly broken.

No support for Skype.

No support for webcams.

All these issues have been open for years. They only introduce basic bug fixes but not much else.