Putting stroke vs Putter style

Consistency.........making sure that the path and face angle at impact is correct and consistent, that you aren't adding or subtracting loft, tempo, that your arc is not too open or closed so you slice across the ball. All the same stuff as a full swing but in miniature.....and, of course, where the margins of error are so much greater,

1 degree open or closed at impact means you miss a 8 or 10 foot putt.