.

the point isn't whether he's weak or strong. It's simply that it will be uncomfortable for him to stand in full armor. He won't be able to put it on himself, nor will he be able to get up from the ground.

As if I didn't understand.
The myth about the impossibility of standing up originated from tournament armor, which weighs around 70 kilograms.
Even plate armor weighs twice as little and is much more comfortable. And it appeared already at the decline of knighthood. Before that, chainmail, plate, and scale armor were used, which are even lighter and restrict movement less. Moreover, the head and torso were protected first. Most knights didn't have greaves or vambraces, at most chainmail shirts and trousers over leather ones.