> so that if the video stream gets jammed they can finish off the mission autonomously.

The streams mostly don't get jammed anymore, because the low-cost FPV drones are physically connected to the ground by a long optical cable. The extent of their autonomous dangers are limited by the amount of fibre-optic cable left in the spool when they take off.

Optical fiber drones is still the minority of drones (both because more expensive and because it has other downsides than radio)