Just in case this requires explicit clarification:

iptables-restore < /etc/iptables.conf
# now I have a firewall
nft flush ruleset
# now I don't
iptables-restore < /etc/iptables.conf
# now I do
nft -f /etc/nftables.conf
# now I have whatever that is, read: nothing by default

This would have something to do with the fact that iptables uses the nftables 
backend, I guess?

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