Classic UNIX behavior was also to have plaintext passwords in /etc/passwd, the shadow file was invented much later... But why should we jump through hoops for

Classic UNIX behavior was also to have plaintext passwords in /etc/passwd, the shadow file was invented much later... But why should we jump through hoops for something that was broken over 15 years ago? Do you still filter ping packets on your router because back in the '90s large pings would crash[1] many operating systems? [1] http://en.wikipedia.org/wiki/Ping_of_death http://en.wikipedia.org/wiki/Ping_of_death