I'm not saying you can't run software with duplicate libraries installed. I'm saying there is conflicting software, both on individual distros and across distros, that is simply not currently created in a way that can be installed side by side and run without extra steps involved. Specifically conflicting file names, but also conflicting functionality which extends beyond just shared library conflicts. And i'm saying that Docker serves the function of "fixing" a problem which package managers did not create.

> I submit that the only valid measure of whether you know how to deploy software or manage systems is whether systems get deployed or systems get managed.

If you don't care at all about the result, sure.