We have tried the apps in the marketplace. It is cool and should save time to start a droplet with the necessary software installed and configured. The only downside we saw so far is that you are pushing people to use UFW. In the end of the day, we are not saving time at all.
In my opinion, UFW is unnecessary and complicates the firewall rules more than if we create them manually as we all have done for so many years. It also doesn't play well along with Docker, as Docker changes rules as new containers and created / configured. New system administrators and developers should take a few minutes, learn iptables' basics and go from there.
Please stop using UFW on marketplace images.