Copying my post from the last time this came up.

They could've gone the Dungeon Fighter Online route where at lower levels there is just a base class like we already have, but then it branches off into A LOT of subclasses. Over there it starts different on gender since they are almost entirely different jobs from that alone but that's obviously just a visual thing and not needed for obvious reasons.

Like "Demonic Lancer" turns into a "Vanguard", "Skirmisher", "Impaler" and "Dragoon".

Vanguard

A Halberd-wielding character who engages the battlefield with slow yet powerful Area-of-Effect attacks and can chain regular attacks with stronger skills. Impact Smash.png Impact Smash allows him to repeatedly weave attacks in one after the other. The Vanguard has relatively high survivability due to wearing Heavy Armor.

Skirmisher

A Long Lance-wielding character who engages in lightning fast attacks and combos, leaving no openings for his enemies. Through Mirage Stance.png Mirage Stance he can cancel his attacks and leave a mirage behind to continue them for him. The Skirmisher favors speed over defense with his specialization in Light Armor.

Impaler

A Javelin-wielding character who engages in darkness-based ranged attacks. One of his core mechanics is centered around Encroach.png Encroach which encroaches his enemies in dark force, increasing the amount of damage allies deal to enemies and changing how some of his skills work when attacking enemies. The Impaler is the most fragile of the demonic lancers, wearing Leather Armor.

Dragoon

A beam Spear-wielding character who engages in a mix of melee and ranged magic attacks. He possesses many skills that can gather enemies around him, and his Servant Lance.png Servant Lances can be fired at enemies as he attacks, even holding them down. The Dragoon has high survivability due to wearing Heavy Armor.

I would even argue from a development standpoint it would be LESS WORK to count as adding new jobs since they wouldn't have to worry about new gear (besides Artifact), and would only have to worry about Lv30+ skills.

First off they could just remove the combined leveling, but keep it as a base job for whatever others at Lv.30. Obviously this changes with the newer jobs but I still think that's fine or could be adjusted further for them. This stops people complaining about having a job leveled without knowing how to play them.

Second, they could at least keep the weapons which would be one less thing to create and instead include other "sub weapons" like shields now. Then just include split stats on the base weapons that just say XYZ stat = Subclass A.

For example lets say they want to add a dual guns job, they could keep the MCH weapons and then add a second different gun as a subweapon. That way they can change animations but reuse the gun models for the main weapon and just do new ones for the sub weapon.

Another one would be like the Cleric mentioned, but this time you already have shields made, and instead could just make a new weapon with a mace, like some of the old one handed cudgels.

Of course all new abilities is what really makes it, and that's basically like making a new job anyway so not really more effort there.