Since I already touched this theme in my feedback topic I'll start with the link
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=737932#Post737932So... you're partially right, partially wrong, OP.
The assumption that it's much harder to hit a target just because it's smaller is wrong. On short distances an archer never aims at the border of the silhouette, he aims at the center of the silhouette. So overall silhouette size changes nearly nothing for a normal trained archer, it's somewhat a dot for him anyway. For better understanding how aiming happens with the bow -
https://youtu.be/Y-RnSsP3ix8In the game we have laughable 18m distance for ranged weapon.What really creates problems it's shooting straight downwards or at very small angle downwards with bows and crossbows, because of their construction and the way you would normally handle those weapons for precise aiming. It as BraveSirRobin said:
at a steep downward angle as maintaining the 'perfect T" and only bending at the waist is tough
Also you scheme on "prone" disadvantage is wrong. It looks as if our archer would lay down himself to shoot the prone target.