On Tue, Jun 23, 2020 at 2:33 PM clime <clime@fedoraproject.org> wrote:

So I don't really get even after almost five years where modularity is
going or what it wants to achieve. I don't understand its use-case for
any of Fedora, RHEL, and CentOS because disabling
parallel-installability to allow parallel availability is imho not
really an option. But yeah...maybe I am missing some angle. In that
case, please, explain it to me because I would really like to
understand...

clime

clime,
I just started a new thread where I try to share some background history and context.  Hopefully it helps.  It should direct you to all of the other documentation that explains most of your questions.
https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/SHMBYIGHHQYMNYD4HL2LV45BVZVZ3I5B/