Some times it hard to understand what apple is doing.

Why remove the bookmark row? Gives me one extra click I DON’T want! Luckily you can change it back.

”The result is a minimalist look that feels like it was taken right out of Safari on iOS 7: One bar, very little text, and everything else is the webpage itself. On a phone, minimizing the stuff around the webpage is desperately necessary. On a tablet it’s a good idea. On a 15-inch Retina MacBook Pro or a 27-inch iMac it feels a little pointless.”

”The centering of bookmarks in the Favorites Bar is also a mistake, because now when you resize a window or add or remove an item from the bar, every other item in the bar slides around. It’s easy to build up muscle memory, knowing exactly where in the browser window you can find your favorite bookmarks—but in Yosemite the Favorites Bar is all shifting sands.”

Citations from:
http://www.macworld.com/article/2450066/hands-on-with-os-x-yosemite-safari-slims-down.html