Jeff Atwood:

This is still one of my favorite quotes about soft­ware. It’s some­thing we inter­nal­ized heav­ily when build­ing Stack Over­flow. Get­ting the details right is the dif­fer­ence between some­thing that delights, and some­thing cus­tomers tolerate.

Your soft­ware, your prod­uct, is noth­ing more than a col­lec­tion of tiny details. If you don’t obsess over all those details, if you think it’s OK to con­cen­trate on the “impor­tant” parts and con­tinue to ignore the other umpteen dozen tiny lit­tle ways your prod­uct annoys the peo­ple who use it on a daily basis – you’re not cre­at­ing great software.