Usernames

Given the worldwide attack on WP sites
I’d think that WP would want to do everything
possible to help to thwart hack attempts.

one way I do this is by adding UN like this
A!Ph4@D0g$

I work a support desk for a WP theme and I cannot
believe how many people STILL use admin for UN

Why is it so hard to add a username with symbols?

I can add this type of UN with my installer.. however,
when I try to add a new user through WP dashboard, I
get an error message…

PLEASE remove this silly rule

thanks
Karen