What is the reasoning for not showing the MPH of each ball rolled as opposed to just strikes?

Actually it's not MPH - it's a percentage of how fast from 0-100% (although you can't actually roll below a certain percentage - some of the guys have tried) that the ball is reading on your shot. The only important thing is to have the percentage the same every shot - so that you can be consistent. Typically speaking, that means that you want to roll 100 % every shot so that you ALWAYS know what the ball is doing and can take out that variable. (Read the post on the lessons)

As for not showing it every shot - if you push the start button while the ball is still rolling down the lane - it will show you the percentage on the replay. You have to push it relatively quickly though or it won't register it. They show you the strikes because that is what you really care about getting, and you can see if your strikes are consistent speed. That, and I doubt if they ever thought about it much! lol

Have a good one!

Telly