You can adjust the angles of individual blades, changing this angle multiple times each rotor sweep, as helicopters do. This is expensive, complex, things wear out, and a safety risk for the aircraft.
Or you can do what quadcopters do, direct drive the rotor and just adjust the speed of the entire rotor. This gets rid of both the Swashplate system and a transmission. It's lightweight, simple, and cheap. The problem is that it doesn't scale well to bigger rotors. When a rotor gets too big, it has enough inertia that you can't speed it up and slow it down fast enough to control your aircraft. Also, as you get bigger, you want a slower spinning rotor, and current electric motors aren't happy direct driving at that slower speed.
If you want to use the simple system, you have to use small rotors for now.
One additional point that is worth making regarding this rotational inertia in the blades is that this is what makes auto-rotation possible. In an engine-out situation a helicopter has a lot of energy stored in these blades and by conserving this as much as possible while 'falling' the pilot can pull up on the cyclic when close to the ground to trade the energy for enough lift to survive the crash. A direct-drive drone propeller cannot auto-rotate, and if for some reason it has an in-flight emergency that interrupts electrical power to the VTOL rotors it will plummet like a brick. I am not sure about the glide characteristics of those wings, but with all of the drag from the non-operative drone rotors I am guessing it would be somewhere between 'awful' and 'lawn-dart'.
You can adjust the angles of individual blades, changing this angle multiple times each rotor sweep, as helicopters do. This is expensive, complex, things wear out, and a safety risk for the aircraft.
Or you can do what quadcopters do, direct drive the rotor and just adjust the speed of the entire rotor. This gets rid of both the Swashplate system and a transmission. It's lightweight, simple, and cheap. The problem is that it doesn't scale well to bigger rotors. When a rotor gets too big, it has enough inertia that you can't speed it up and slow it down fast enough to control your aircraft. Also, as you get bigger, you want a slower spinning rotor, and current electric motors aren't happy direct driving at that slower speed.
If you want to use the simple system, you have to use small rotors for now.