Yes, the flying drone helps a lot since it scouts more easily and can get you a better sense of the layout and can hack some stuff itself. You can also more easily plan a route for your RC car if a physical hack is required and the quadcopter can more easily get out of view
The stealth is broken due to high detection speed but its definitely pretty manageable using your hacks.
I think its high because you could counteract it by causing distractions on the guards.