I’ve been an Ubuntu user for 3 or 4 years. Liked 10.x, loved 11.x, hated 12.x, love 14.x and a few of its variant flavors like Ubuntu Mate and Linux Mint-Mate.
When I install Ubuntu and any of it’s variant flavors, I always enable the firewall by typing this in the terminal “sudo ufw enable”.
I think the firewall should be enabled by default so users don’t have to do anything with it. That way beginners would be protected.
As a beginner, I used Ubuntu 10.x & 11.x for years without the firewall enabled because I didn’t know about it. As an intermediate user I finally realized late in my use of 11.x that I needed to enable the firewall.
So this is really about protecting beginners, and it’d be so easy for developers to implement.