Because this is simply my opinion (and there are multtiple threads with the exact same content).

Meele have much more risk of beeing hit. Be it this thunder cats, who create close aoe. This plants with the close up spore attacks. Cerberus, who has aoe in his front and his back. This big mouthed plant enemy. The first boss of the new 90er ini (and many of the mob).
Than, are there the positonals (even, when they are reduced), that is relevant for max dmg. And not that easy to hit each time. And the phases by bosses, where you can not go near them, because of aoe.
Ranged classes need some drawbacks in combaring to meele, to be balanced. Esspecial the physicaly ones, who can attack the whole time, while running around. Otherwise, would whe have practicly only ranged classes and practicly no meele (i see in most cases more ranged classes as meele classes, in normal raids).

Maybe it is not the cases in the current savage stuff. But, it is the case in older content, story, the 90er ini and probally again in future content.