The bottom thread never follow the loops and swirls I am doing. It makes a huge mess if I don't pull the thread to the top so I can control it. I want the back of my quilts to look as good as the front.

Pam

..on my longarm, on which I do quilting, I pull that bobbin thread up, hold it together with top thread, take one stitch in place, move the head just 1 or 2 threads over, take another stitch, and a third, then I gently tug on those tails and I can feel the knot I have created on the underside pop into the batting, then I clip those tails right against the top fabric and they too sink in... That's how I was instructed a long time ago....

this is what I do, this way you can take a couple of tiny stitches to lock the starting point, clip both threads close and be done with trimming or burying threads, saves lots of time & frustration.

To stop the bobbin thread being sewn over during the quilting. You might end up with not enough to pull through after you have untangled it.

Absolutely you can pull the threads to the back of the presser foot.

Pulling the bobbin thread up to the top ensures that you don't get tangled nests on the back; In addition by holding the threads with your fingers whether you are FMQ or piecing ensures that the tension at the beginning of a section or seam is even. Also it makes tying threads and burying them in batting is easier. I do tie off all my threads in the middle of the quilt. If the seam starts at the edge I don't tie because other stitching will cover it.