This is basic for anyone sewing blocks or strips together, and I mean a LOT of them. I just finished a quilt with about 1275 squares, each 2 inches finished, and chain piecing was essential to getting it finished timely.
Think about this: whenever you want to sew something together, you have to place your piece with your 1/4 inch seam allowance, lower your foot, pull back on your bobbin and top thread (to ensure the material isn’t pulled into the bobbin casing or that the thread gets all tangled), and then go. If you stop, take the piece out when finished, and do that all over again, you are wasting a lot of time and effort you really could use to keep sewing!
You do want to keep the pedal going, you can pause as needed, but you want to keep your thread going, and that alleviates the need to keep cutting, pulling excess thread to the back, lining up, starting slow, etc.
This photo shows the chain after I have removed it from the machine, prior to cutting the chain. Give it a try, and you may be surprised at how much time you save!!