"Lining up" is a huge time-saver - compare making some shelves out of wood, where you will want to be fairly careful to measure the position of each shelf on ea

"Lining up" is a huge time-saver - compare making some shelves out of wood, where you will want to be fairly careful to measure the position of each shelf on each side to make them square and level, with "count 20 holes down on each side" (and I say this as someone who mostly knocks things together out of wood since I have more of it around - but still admire the Lego-esque predictability of extrusions).