I dunno, it kinda reminds me of the template game characters in Overlord. Except there are a lot more of them here, and they don’t have as much screen time as the characters in Overlord.
Personally I see it as a way for the author to test out character concepts and test relationship types in an environment where you can replace them if necessary depending on reader responses to them. Considering this is an adaptation of the Light Novel, it also stands to reason that a lot of thing have been cut out to save on time and pages.
Taking that into account, what we’re left with is pretty good all things considered, it could be worse, it could be better.