Re: Why
My first thought too.
I can only assume (without any other knowledge of the Perseverence mission) that the top of the lander is covered with other instrumentation: cameras, solar panels etc, that are of higher priority to the mission overall than an experimental minor element.
As such they've had to come up with an inventive alternative solution (aka a bodge) in order to add the drone to the mission.
Biting the hand that feeds IT
