"Effectively" retired, mind.
Agreed, it's much LESS of a security risk when you're in a large business, hidden behind multiple firewalls. Of course, those companies are security conscious enough that they're not likely to LET you turn NET SEND back on.
Sadly, a lot of places I know of aren't even security savvy enough to have proper firewalls in place. Being on the network can be just as bad as being plugged directly to the outside world. 😞
Bottom line, unless you just HAVE to use it, leave it be.