You get to choose 90% of what you train now. Maybe you can look at it this way- Your players cannot practice 100% every single day because sometimes they are tired, or slightly injured, or have relationship problems. So they, over a week, get 90% of their theoretically maximum training. That sounds pretty good- to be at 9 of 10 every day in practice. But wait! They actually are at close to 100% because since they practice so hard (90% every day!!!) their auxiliary skills improve. To just make blanket "I hate this" statements is just so easy and negative and closed-minded, in my opinion. The truth is that speeds will be hardly noticeable unless players are trained for a very long time.
Once I scored a basket that still makes me laugh.