https://www.debian.org/doc/debian-policy/ch-sharedlibs.html#s-sharedlibs-runtime
[...]
If you have several shared libraries built from the same source tree,
you may lump them all together into a single shared library package
provided that all of their SONAMEs will always change together. Be
aware that this is not normally the case, and if the SONAMEs do not
change together, upgrading such a merged shared library package will be
unnecessarily difficult because of file conflicts with the old version
of the package. When in doubt, always split shared library packages so
that each binary package installs a single shared library.
[...]
Reading this section make me feel that lib such as:
$ readelf -d libvtkImagingColorPython27D-6.1.so.6.1.0