Does anyone have a good reason for me to NOT install and enable UFW?
ufw can't be used with ipset AFAIK, and I use ipset for many reasons (fail2ban, block access outside of my country etc).
But If you only SSH your host from one static IP, you probably do not need fail2ban at all.
Anyway, I am not sure that port 80 is blocked by your firewall and not your hosting firewall