Thanks for pointing that out.
For now, it looks like you could use the Terminal for some things, really geeky though.
I see these "Network Utility" commands available in Terminal
netstat -- show network status
ping -- send ICMP ECHO_REQUEST packets to network hosts
traceroute -- print the route packets take to network host
whois -- Internet domain name and network number directory service
finger -- user information lookup program
Use the man [manual] command to see details: "man netstat", "man ping"…
and to see other network commands in Terminal that may be of interest, try
apropos network
Barring that, I would search the App Store to see if there are replacement Apps that work for you.
ivan