You can actually draw, design, print an entire raid in just 3 months. Especially when you have a team of professionals working on it. I know this is a distant comparison, but look at skyrim's mod workshop on steam. one day the workshop released, then, a short time later mods started coming out. These were usually just teams of two to three people working with a tool they JUST got access to. around 3 to 4 months later, we got high res texture packs, entire dungeons, some with 3 to 6 floors, different magics. they CAN very easily design a new raid in that time. They dont need maps. The map areas are modular. They use the SAME shapes with different textures. They dont need to really do AI. You think they use a CLI to map out of the enemies attack path? Hell no. Its probably a bunch of for and while loops. Id wager that for pathing they already have a tool to click and drag markers. The first thin huge studios do is make a platform that everyone can use, company wide to make the game.