Why is practising putting from the same position beneficial?
Practicing an identical putt over and over will do wonders for your stroke mechanics. It’s like practicing tennis shots against a wall. It will groove the action of the stroke very quickly. Also, knowing ahead of time that the putt is straight, and the challenge is inch-perfect, sharpens your focus and rapidly improves your control. If the putt deviates from a straight line, then you can quickly narrow down the reasons why and do something about it.
When you can view your putting from the angle above (by simply recording from your smartphone) you will be amazed at what it can teach you about exactly what you are doing as you stroke the ball.