One of the worst things about Apple is how they sabotage their own products with software updates. The update for wrecking unlocked iPhones is a recent example, but there are plenty of others. I remember when they restricted iTunes so that only five people could access your library every time you booted up. That made sharing music on big local area networks (like university residences) a lot less effective. Also, I remember when they forced a volume limitation on my iPod Shuffle by means of an update. I don’t think there has been a useful feature added to iTunes for years, except maybe the automatic downloading of album art for songs in your existing libraries.
Now, I only install security updates on my Mac. Anything promising new features is just too risky.