I try never to mess with my stack unless something breaks so badly that changing it is necessary. This hasn't happened yet in... six years, for my current server? This is the first time I've had a "home server" that's more value than the cost of maintaining it, and frankly it's because I neglect the hell out of it and resist any urge to go make things "better" just-because. And because of the isolation of Docker images from the awful mixed-together system-and-userspace distro package manager—I can upgrade any daemon I care about with a tiny edit to a shell script and a couple commands, works every time, never fucks up my base system or other unrelated daemons due to any stupid crap like sometimes happens when you try to get newer packages on an older version of a Linux distro.

Docker's just a package manager and process manager, the way I use it, and has performed flawlessly in that role.