

Full points for Docker
In my opinion anything that only has docker installation should have points removed. Having it as an option is fine,but having it as the only option has several issues
1- Not every OS even has docker. Take for example FreeBSD
2- Many, non technical, people may not have or even know what Docker is. Having it as the only install option actually ads complexity for that group of people
3- Having to install docker for only one system that you want to install adds an entire layer of complexity and in some cases may even outright discourage someone from installing some software
My take on the scoring
Very Easy: Multiple easy install methods (e.g., one-command OS package, single binary, and/or Docker). If only one install method it should be single binary or OS package. Great documentation. 18–20 points
Easy: Limited easy methods or only one. Some configuration may be needed, good documentation. 15–17 points
Moderate: Docker is the only method or manual setup. Average to pool documentation 11–14 points
Hard: Complex setup, needs regular updates or custom config (e.g. DNS, spam) 6–12 points
Very Hard or Proprietary: Little to no self-hosting support, undocumented 0–5 points