The question posed—why quadcopter-style drones haven't scaled into commercial passenger aircraft despite their apparent ease of control—touches on a genuine gap between hobbyist perception and the engineering, regulatory, and economic realities that govern certified aviation. The premise itself deserves unpacking: modern multirotor drones are indeed easier for a novice to fly than a fixed-wing RC aircraft, but that ease comes entirely from flight-control software, not from the underlying physics being simpler. A quadcopter's stability is manufactured by dozens of software corrections per second reading gyroscopes, accelerometers, barometers, and GPS to constantly adjust motor speeds. Remove the automation and a bare multirotor is wildly unstable—arguably harder to hand-fly than a Cessna. What the original poster is really observing is the maturity of consumer-grade flight-control computing (largely a byproduct of smartphone-era MEMS sensors and cheap processors becoming available in the 2000s-2010s), not an inherent simplicity advantage over fixed-wing aircraft.
For working pilots, the more relevant distinction is between hobbyist multirotor toys and the eVTOL (electric vertical takeoff and landing) aircraft that companies like Joby Aviation, Archer, Beta Technologies, and Wisk are actually developing for passenger transport. None of the credible eVTOL programs are pure quadcopters scaled up; they use tilt-rotor or lift-plus-cruise architectures precisely because a multirotor configuration is energy-inefficient and lacks the autorotation-style redundancy needed for a certified passenger vehicle. Battery energy density remains the binding constraint—current lithium-ion cells offer roughly 1/40th the specific energy of jet fuel, which limits payload, range, and reserve margins in ways that have nothing to do with control-system complexity. Scaling a drone architecture to carry "hundreds of passengers," as the poster suggests, runs into basic physics: rotor disk loading, power-to-weight ratios, and the sheer energy required for vertical lift make large multirotor aircraft impractical regardless of how good the flight-control software gets.
The real bottleneck, and the reason this matters to the broader industry, is certification rather than flyability. Type certification of any passenger-carrying aircraft under FAA Part 21/23/25 (or EASA equivalents) requires demonstrating failure modes, redundancy, structural fatigue life, and software assurance (DO-178C) to a standard that consumer drones never approach. Joby and Archer have been in FAA certification processes for years, and even with billions in funding and relatively modest passenger counts (4-6 seats), they're targeting service entry in the late 2020s—not because the vehicles can't fly, but because proving airworthiness, establishing pilot type ratings, building vertiport infrastructure, and satisfying air traffic integration requirements takes enormous time. This is the same friction that has always separated "can build a flying thing" from "can certify a vehicle the public trusts with their lives," and it explains why the gap between hobbyist drone capability and Boeing/Airbus-scale passenger transport is regulatory and economic as much as technical.
For pilots and operators watching this space, the eVTOL/AAM (Advanced Air Mobility) sector represents a genuinely new category worth tracking—not as a replacement for airline or business aviation, but as a complement for short-haul urban and regional routes. Legacy manufacturers like Airbus (with CityAirbus) and Boeing (through its Wisk stake) are indeed involved, just not building giant passenger quadcopters, because the engineering doesn't support that configuration at scale. The broader lesson for the industry is that consumer drone proliferation has been a genuine technology accelerant—normalizing electric propulsion, distributed motor redundancy, and autonomous flight-control concepts—but the leap from a $2,000 camera drone to a certified, revenue passenger-carrying aircraft remains as large as it's ever been, governed by the same rigorous certification framework that has shaped aviation safety for a century.