Originally Posted by
SDaemon
Of those examples the only one I've played is Skyforge where you basically play as developing Gods. The classes, and everything else really, are unlocked through the Ascension Atlas through prestige. To start from you choose from 3 classes, but you unlock others by progressing through the Atlas. Once you've reached a certain point on one of these 3 "starter" classes you unlock the upper tier. Think of it as similar to FFX's sphere grid in terms of what the atlas offers. For comparisons sake you would play as Black Mage (Lulu) until you progressed to the point where you could play and progress as a White Mage (Yuna). The game gets very grindy at the end with prestige which is the games way of "leveling", since you can essentially go on and on. There are raids and such that you can do to build prestige, get gear etc.
Ex. If you want to play as a Monk, you are going to have to put in a good chunk of your time progressing through the ascension atlas to unlock the advanced jobs. I haven't played in months, but it took me about a day of play time (24hrs played) to get Necromancer.
Similar to XIV though you can swap between classes any time you are not in combat.