I have a ton of quilting motif files for my Janome 11000SE. That was the way I wanted to go when I started quilting, because I absolutely hate FMQ. I suck at it and thought this would be a great idea.
I was wrong, it is good for some things like table runners and small stuff, but to do a whole quilt is rough unless you are just plunking quilting motifs all over the quilt.
Sizing all the files to fit your space is time consuming too if you even have the software to do that, my Janome will only decrease or increase about 10 to 15 percent any design so you need to use a standalone program for that stuff.
In theory it's great, in practice, not so much.