The lady in that class doesn't know what she is talking about, you ask any quilter, of any experience. The older machines are tough, sturdy and heavier than the modern ones so that don't start "wandering" when you are quilting. All the machines that I have, 3 of which are "vintage" do the most amazing straight stitch, and I do mean straight and I find the free-motion on them is second to none. Just keep it dusted n oiled and it will last you for your lifetime and beyond unlike the modern ones. I spent nigh on £1000 on my Elna 7200 6 years ago, last year I spent £50 on a Singer Capri, circa 1950??? and I much prefer the old Singer.
I found to my cost that all the bells n whistles on the Elna are not needed for quilting, just a straight stitch, free-motion facility and possibly a zig-zag stitch is all you need IMO :lol:
What model and make is your machine?