1. Before the update, clicking an offsite link would open a new tab. That was a useful feature that doesn't always behave that way now.
2. The number of posts for members is no longer displayed. This was useful information for identifying spammers whose post counts are typically five or fewer.
3. Clicking "Mark All Viewed" no longer refreshes the screen.
Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away. -Antoine de Saint-Exupery