It’s so hard to make something work correctly. If you’ve ever made anything, you know this. There are a million decisions that have to go into each element of whatever it is that you’re making, and they all have to work together. If you’ve ever furnished an apartment you know this to be true. Or put together a piece of Ikea furniture while furnishing said apartment. If one screw is out of place, the whole thing threatens to topple right down. 

This is why they say to measure twice and cut once. When building something, you need to make sure all of your t’s are crossed and all of your i’s are dotted. This is easier said than done, of course. Sometimes you’re in a rush and you just want to sit in that Ikea chair and take a load off and you’re tired of putting it together. But you start cutting corners and you might end up on the ground.