[microtonal]

Otherwise, we'd need to tailor the images and configuration for the individual language type. When a new language is introduced, it can take 'days or months' to get everything working well.

Yes, and now you have to tailor the distribution in the container to the new language. Of course, the impact is smaller than changing one system that contains everything.

However, this problem was long-solved before containers (as in OS-level virtualization) as well in virtualization (Xen, KVM, etc.). (Of course, FreeBSD had containers for ages, but they were largely ignored.)