the machine making you go 'hell for leather'
Yes machining pieces is (usually) quicker, but one has to remember that it isn't (usually) a race. Taking a few moments to line things up properly, and pin the fiddly bits will save time in the end (this is the voice of experience). I remember reading and ignoring all that advice about checking the seam allowance and one's stitching first and then wondering why things were wonky. A ¼inch foot and/or a line to guide the edges along, sewing at a sensible speed improved it all no end. It doesn't have to come out at competition level, but you want to look at something and be happy with it, even when you know that the next time you'll do better.