Greetings,

To answer the question about "why can't these new jobs also use relics?"

The main reason why rune fencers and geomancers will be unable to equip Relic and Empyrean weapons is because those weapons were created and balanced around the jobs that existed at the time. This is also the reason that blue mage, corsair, puppetmaster, dancer and scholar were never given access to relic weapons.

However, as Mythic weapons are job-specific, it won't be a problem to design a weapon that is best suited specifically for rune fencers or geomancers.

As an additional note, when we release content for these new jobs in Seekers of Adoulin, they will be able to earn the equivalent of Relic equipment, Empyrean equipment, and Mythic weapons. We simply used these terms to make it clearer and we haven't officially decided on what names these types of equipment will take.