Is 88MB too much for you to download? Is it too much to store on your hard disk? Is that "Burn Disk" button in the bottom right when you're viewing a playlist too distracting? Is the UI hard to navigate now with all these features? Is the "Share on Facebook" contextual menu item getting in your way when you're trying to listen to music?
All of those things (and more) could be potential arguments against adding those features to iTunes. However, I'm pretty sure that the vast majority of iTunes users would answer "no" to every one of those questions. Apple has done a great job of adding features to iTunes without sacrificing much usability at all. If you click the button that hides the Genius bar, then the main screen is still just a list of playlists on the left, and your music library in the main pane. Pretty simple.
Thousands of other people use and love those features. People love Macs because they don't need a separate application to burn CDs. Have you forgotten what a refreshing experience it is for a PC user to use a Mac for the first time and realize that it does everything they want out of the box?
Presenting users with a set of checkboxes during install is one of the worst things you could possibly do. That's a usability nightmare. It's like setting a trap for your users. How do they know which components they need? How can they be sure it will work if they don't install all the components? What if they choose incorrectly and want to install more components later? Is that possible? The lack of these types of installers is yet another breath of fresh air when you switch to Mac OS X. In most cases you just drag the app into your Applications folder.
Apple's applications need to work for ordinary people, not just techies. If you're going to accuse Apple of getting usability wrong, you better be a legitimate expert and have a compelling argument.