The technique of running a car with C4 attached to it into an enemy tank has been around for a long time.
While it had a good return in that it could destroy the tank instantly, it could only run on the ground and risked exploding itself if it was noticed and attacked by tanks or engineers first. Yes, the risk and return were balanced.
Also, speaking of attacks by flying drones, BF4's MAVs were also able to roadkill enemies.
Sure it was frustrating, LOL, but the MAVs were large in size and could be destroyed quickly with gunfire. Distant MAVs could also be targeted with AA launchers. So I didn't have any complaints.
What about the C5 drone? It is very small and flies quickly through the sky. It can blow up enemy troops and heavily armored tanks with a single blow. The moment they stop to ignite the C5 is the only chance to strike, and if we miss, we are dead. If the drone attack fails, the user does not die, but simply waits in the shadows where it is safe until the next drone or C5 is replenished.
Furthermore, MAVs could be shot down with AA launchers, but what about C5 drones?
The risk/reward doesn't seem to be balanced.
BF is a sandbox, and I believe that fancy techniques should be allowed, but the C5 drone just seems to make other players sick.