[sandworm101]

This study assumes that Simpsons characters are manufactured purely for the use of the show. It ignores the possibility that the characters are created for the cast, not the audience.

Every TV show is a creation of a team. That team has certain members. You have to use these people. Absent special circumstances, such as one actor wanting to play at being a director or do a solo piece (Alan Alda, MASH) the work has to be balanced across the cast. Sometimes this is even dictated by contract. Recent seasons of TheBigBangTheory seem to follow contract math regarding screen time. Many episodes seem to alternate between male and female groupings. Friends did this, but TBBT seems more mathematical. One could probably reverse-engineer everyone's contracts from screen time alone.

So perhaps TheSimpsons' gender bias is based on the writers creating characters for the voice actors they have available, a cast setup long ago. Maybe they even are writing characters specifically for voices created by that cast. That would also create a gender bias.