Originally Posted by hdasmith
When you say "we", who do you mean, because Apples support pages suggest that you DON'T unless you are experiencing difficulty.
Actually, some Apple engineers do recommend doing it.
Apple's pages don't recommend NOT doing it unless you're having problems, they simply say that you don't have to do it.
That's very different.
Saying that they're not recommending it because it's not required, and saying that they aren't recommending it because it could cause problems are very different things.
The fact is that is doesn't hurt to do it even though most of the time it accomplishes nothing.
I often recommend it to people who know little about the computer, on the off chance that some problem could be averted that they wouldn't understand, and could panic them (I've seen it happen).
There are rare occasions when an update, or upgrade will cause a Permissions error to occur. Mostly, when fixing permissions, if it doesn't take too long, it's worth the peace of mind.