It's "annoyingly hard" because you're not using modern tooling. If Docker is unavailable on your preferred OS, then that OS is stuck in the past. Simple as that.

Docker makes it easy to install a program, including all its dependencies, in a repeatable way. Since you're familiar with BSD, it's similar to jails except with better isolation, fewer security holes/issues, and the software you want to run is preinstalled. Docker containers are essentially mmutable which makes upgrades easy - just throw away the old container and replace it with the new version. (persistent files are stored separately, in "volumes")

You can of course manually install the same software by looking at the Dockerfile and manually performing the same steps, but there's no guarantee that it'd work well on an unsupported OS.