Thank you for (job changes): Thank them!

[OcieKo]

That isn't just it though, there's also the lore behind the Job. Two mage tribes/groups put their powers to make the Red Mage. Which I believe is also the reason why we have the Focus.

Kindof working more the active play angle, and RDM has been a mix of WHM and BLM lore wise for pretty much since their inception into the Final Fantasy series.
Im referring to the job spell reveal videos simply opting to show more visually stunning options rather than a comprehensive or exhaustive list of skills and spells or even a proper rotation, just focusing on flashy skills and showing the new job gauges working.