Keep in mind ... there are so many variations on the "right way" ... and don't let one person's right, discourage you.
One of the joys of FMQing is that you are not moving the quilt as much. Consider, how you quilt with a traditional set up ... you stitch along, come to a corner, and then have to re-position the quilt. Another corner or angle ... move it again. If doing a design in a 12" block that could mean a lot of re-positioning to get it done. Whereas for a FMQ'd design on that same block, you just keep quilting. And if that 12" block is only one of many in a quilt ............ oh my how, tiring it would be.
Once you get thinking about this, you will see why it is helpful to learn to FMQ in all directions. As oft has been said, it's all about practice, practice, practice!