What change do you want to see on your main class for Endwalker ?

[Kalaam]

I know that it is a controversial opinion, but I would find it to be of interest if Red Mage was sort of(but not in full) a "melee caster", that weaves oGCD Rapier attacks between casting spells, especially in the case of that Red Mage has a literal every other spell dual-cast, that makes every other spell cast be a instant-cast, so we could weave oGCD Rapier attacks after dual-cast, with ease.
More or less, I would just like to see Red Mage be a melee and caster hybrid, that uses Rapier skills more, along-side casting spells.

I wish so too, but the issue is that it would throw a wrench in full party content. RDM would basically take a melee's "spot" mechanic wise, it would need careful balancing.