The latter part of what you said is absolutely right. You can't continue to support old features and expect to thrive.

BUT what it seems that Facebook is lacking is a clear sense of direction when it comes to providing a platform that is accessible yet robust, interactive yet intuitive.

Your conjecture that the product changes in ways that are useful to the majority is a conjecture I refuse to buy because if you were to actually give your user base a chance, give them a voice and poll them, I'll bet my salary for the year 80% of them (techies and non-techies alike) will agree that Facebook has degraded to the point of being almost useless.