Containers abstract over reducible complexity. Functions (should) abstract over irreducible complexity. As long as we're asking hypotheticals — why do applica

Containers abstract over reducible complexity. Functions (should) abstract over irreducible complexity. As long as we're asking hypotheticals — why do applications need to control the global OS namespace and the dependencies between elements in that namespace to a degree that the applications themselves can't be easily deployed without containers? Can that problem be reduced? If not, why not?