Systemd, nftables, and iptables

[Stephen Satchell <list@xxxxxxxxxxxx>]

I'm building a CentOS 8.1 system on a Protectly four-port appliance, to 
be my new firewall.  To avoid problems, I'm trying to remove IPTABLES 
completely from the system so there is no chance of interference between 
the two firewalls.

Problem:  systemd requires iptables-lib.

1.  Why?
2.  How to keep systemd from requiring iptables-lib?