The NBA has evolved over the years. The game has gotten faster, quicker and higher.
Players of all positions are able to jump, run and shoot better and faster than ever before. One of the main things that general managers and coaches look for these days in drafts is not necessarily shooting percentages (which do help), but rather the things that cannot be taught at the next level: height, speed, reach, leaping ability, vision.
Players in the NBA today do not just have one position, but two or three positions due to their athletic ability. The athleticism is a huge factor in the drafting process and a major reason why the NBA hosts combines for players to showcase their athletic ability.
In this year's draft, athleticism is everywhere, but there are only a handful that are off the charts.