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[Fyrebrand]

Usually casting requires magic users to be focused and calm to call forth incantations. They don’t go hollering around making uncontrolled noises.

Incantations are literally chanting magic words, though. It is a very common fantasy trope that witches, wizards and the like often recite verbal phrases necessary for their spells to function. Why else would the Silence condition prevent spellcasting?

as much as i think it would be cool go have the characters mutter an incantation while casting, or saying something when the cast finishes like in octopath for instance, i think itd get annoying after a while since youd be hearing it almost the entire fight

This is probably also true. Imagine a whole party yelling out their spells... "Stone! Stone! Stone!" "Fire! Fire! Fire!" Even if they made it so you only heard your own character's voice, it would still get pretty tiring.