I wholly concur !
Cyclist subconsciously automatically balance 2 wheels, the 'gyro' effect keeps it balanced and moving forward.
The 3 rd wheel upsets this autonomic response, with the centre of gravity up high perched on the saddle.
Bring that down and sit within the footprint of a recumbent ,then you have a far more stable machine.
But even then ,you can upset a recumbent trike, I 've done that twice in 30+ yrs, once at high speed, and once amusingly at low speed, on a and new trike.
Even recumbent trikes ,you my never master the art of riding 3 wheels, always the trike will try and throw you off.
I dont understand what you say about a trike. Anyone, even if they have never ridden a bike before can ride a trike.