A while back, I complained about the design of the YouTube icon, saying that it “doesn’t fit in with the general Ice Cream Sandwich theme”. I didn’t say why, and so a few people thought it was a baseless complaint.
But looking at old Android screenshots today showed me exactly why I feel it’s so out of place: the icon’s light gray background reminds me of (and, likely, was designed for) an Android that looks like this: http://i.imgur.com/ym4W4.png
That’s not what Android 4.0 looks like. The YouTube icon is just one more relic left over from the old Android, and I’m not a fan of those.