I've noticed these rules can be used to harden WordPress:
The [L] flag is implied with [F] and is not needed.
That link is per Apache 2.2, but I'm pretty sure it applies to older version as well, like Apache 1.3x as I previously used them.
It's not much of a wasted processing cycle, but it does reflect on someones knowledge and usage of Rewrite Flags. It could also be a waste if someone assumes that it's always required and decides to implement it with all their rules, which I see all over the net, including here.