One of the biggest issues as this technology is scaled up is the fact that landing weight will almost always equal takeoff weight. Alright at 2000kg, no so good at 300,000 kg. The implications for landing gear and aircraft pavements are not inconsiderable.
HUH???
That’s an advantage not a disadvantage. In a heavy the take off weight is much higher than landing weight to allow for fuel consumption not to Carry extra useful load. If the take off weight = landing weight then the undercarriage need only be designed for the landing weight which is generally considerably lower.