Not quite. The 80Mb represents the uncompressed on-disk size. Those bits can appear in memory in two main ways. It can be executable, in which case large parts will be shared (remember, containers are not like VMs). Or it can in the FS cache, in which case bits will be evicted as necessary to make room for executables.

There's a case for tiny images, but it's in severely-constrained environments. Otherwise folks are fetishising the wrong thing based on a misunderstanding of how container images and runtimes work.