No, I don't think so. Skill is a matter of practice, not a matter of machine. You can do lots of great stuff on vintage machines that have solid stitches. If you are thinking about expanding techniques or frustrated shoving large quilts through a small harp, then you might consider upgrading. But I don't think the latest and greatest machine leads to better quilts. I do all my piecing on mechanical Berninas. I do quilt on a Sweet Sixteen now, but that is because of the harp space it allows. I did not invest in the stitch regulator.
Cheers, K