> It's a one time time investment

No, because the software that needs to be installed into them keeps changing (new versions, new packages, etc.)

Sysadmin is a job for a reason. And with containers you are a sysadmin for more than one system.

I see, it's rare to interact with someone that hasn't discovered dependency management yet and hasn't made that part of their project. If you did manage to integrate that into your, it would consequently make it a one time time investment, because things are automatically pulled in with the versions specified.