I've been using 2.5 since I started quilting about, um 16 years ago - haven't had any raveling seam problems!
If you're having a problem with your fabric getting sucked down into the feed dogs/bobbin at the start of your seam, take a small piece of fabric, maybe 2" or 3", folded in half, and holding onto to your threads, start off with that. Then just 'chain' right onto your quilt patches & you should be OK. Clear as mud? LOL