Speaking of network debugging tools, I really miss the network connectivity troubleshooting tool (and supporting network configuration database service) at Meta that has panopticon-like awareness of all networks, network rules, host firewall rules, and user/service user privileges. It ran with syntax paraphrased like the following:
{{whatever_it_was_called}} {{src_ip_or_host[:src_port]}} {{dest_ip_or_host_or_network}}:{{dest_port}} [service_or_user_privileged_membership_group]
Sadly, sysadmin and netadmin tools, responsibilities, and skills are withering trades that have been subsumed or ignored in the modern SWE/SRE enterprise almost as afterthoughts.