[treflop]

It's because systems are highly complex and there are a thousand little things that you need to know to use them. Once you have experience working with it (or even reading enough docs), you know which of those thousand things should take up the most space in your mind.

But if you are new and are pressed for time, you only look at maybe a fraction of those thousand things, and inevitably you miss some important things.

AWS used to not have sane defaults for S3 buckets.