In order to grab the target Netflix audience that they are looking for, the producers need to stay true to the theme and tone of the first Defenders project.  The Daredevil project was dark and brooding with a very sinister tone.  The subject matter was adult in nature and the writing was geared toward an older crowd. This was not your typical kid show.

If AKA Jessica Jones wants to repeat Daredevil's success, they need to learn from the show that came before them.  The temptation for the producers will certainly be to go with a lighter tone and appeal to a wider variety of people.  The TV shows on the CW have both gone down this path.  It worked for The Flash quite well.  It wrecked Arrow.

Jessica Jones, as a character, led a tragic life as a child.  The accident that gave her super-powers also took her family.  The story of her origin is set up to be a sad tale from the very beginning; at least it is in the comic books.  So a lighthearted romp really doesn't fit the profile.