Even though Boeing wasn't found liable, they still had to deal with the lawsuits. They have an army of lawyers for that, I'm sure, but this isn't something a smaller drone manufacturer wants to deal with. Plus, you never know how the lawsuits might end up. Someone could argue that the manufacturer (like Boeing in your story) should've spent $5 to offer to implement geofencing and save are children.
Then there's always the hordes of people completely outraged whenever a drone flies somewhere where they think they shouldn't, like in line of sight of an airplane or a park or their house. The less attention these incidents incur, the better - they already have to deal with retarded registration rules and what not, and they don't want to create a demand for more rules that would put people off the hobby.
Of course, I'm happy to fly a manual controlled quad that does whatever I tell it to do, and as long as this option is available, I don't mind the mainstream products being a bit crippled to keep idiots out of trouble.