My proposed skill interface

I'm not a big fan of the circular skill unlock interface that ArenaNet showed that would be coming to the game slightly before the release of the Heart of Thorns expansion. I really dig the new streamlined trait interface, and I think this could borrow from the linear horizontal design.

As the original system, the player would click the + button to spend Hero points to unlock skills. The number next to the + button would explain how much the next skill would cost.

I feel this is a better use of space. Instead of each type of skills having their own page, everything can fit onto the same page. If more skill lines are added in the future, a simple scroll bar on the right side of the page can be added.