I noticed a difference in shave quality the more I practices and improved my technique. It's a bit of the edge is improving because your technique is improving.

And as for the getting another straight, having a second straight razor allows you to always have one shave ready. So when one needs a touch up or to be sent out to get honed you have your other razor ready. A lot of guys work in rotations, so they have a razor for different days.

It's all up to you.