no, it is that it adds complexity which is no longer needed
especially for image based stuff it's a pain
which includes OCI images for things like docker
but also image based distros like e.g. ostree (as used through rpm-ostree by Atomic Fedora desktops like Fedora Silverblue, but also in similar but different forms something Ubuntu has been experimenting with)
Your comment seems fully unrelated to my point that overlaying images is much more a pain if the things you might want to shadow and/or extend are distributed or even duplicated across many different places when they could be just be in one place.
especially for image based stuff it's a pain
which includes OCI images for things like docker
but also image based distros like e.g. ostree (as used through rpm-ostree by Atomic Fedora desktops like Fedora Silverblue, but also in similar but different forms something Ubuntu has been experimenting with)