As a video game, KSP is definitely designed for casuals. The game is, on purpose, kept so shallow and simple that even 10y old kids can easily play and have fun in it. KSP is not a hardcore space simulator. Stock also already has autopilot features; SAS, aka space unicorns inside your ship farting and providing torque. There is no challenge whatsoever in flying manually in KSP. In stock, there is hardly any challenge in designing ships either, just add more boosters, struts and space unicorns. "I'm a hardcore gamer, I play KSP." said noone ever, all aspects of the game are extremely dumbed down by default.