Part of it could be to help ensure that the drones are operated in compliance with national regulations, such as FAA regulations in the US. Modern drones consult databases of restricted zones they are not supposed to fly in, and those databases change occasionally.

For regular airplanes flown by highly trained pilots relying on pilots to put in the effort to learn of changes that might affect a trip works. If a regular airplane pilot flies somewhere they are not supposed to be because they didn't check NOTAMs or were using outdated charts no one is going to say Cessna needs to do more to keep pilots from making those mistakes.

For drones, which require much less training and are sold to consumers, it is much more likely that the operators won't keep up to date. A spate of consumer drones entering restricted airspace would definitely lead to serious pressure on the makers to do something about it.

Similar for updates that fix bugs. With airplanes it is reasonable to expect the operator to apply any updates that the maker releases that fix bugs that might affect airworthiness. With drones, not so much.