Nexon's intention of creating Mihile job?

I think the real reason only Mihile got upgraded to playable status is because everyone (that speaks english at least) hated the class. It's basically a Dawn Warrior with lasers and a normal level cap and some things borrowed from Demon Slayer. (The shield concept, they both have the same 60% Defense and Status Resist skill, etc.) They probably saw this and scrapped the others, which they most likely had planned due to how much easier it is to make classes that are similar to already existing ones.