That's the plot. If you want to make KSP a bit serious, you have to mod the game. Heavily. RSS needs a lot of mods, more with RO, more with FAR, more with Principia, again if you want graphics, effects, shaders... If you want to have fun in orbiter, you just need addons. Of course, we (not everyone) would like to have gameplay in Orbiter, because Orbiter is not a game. For myself, one of the biggest issue with Orbiter, is that you don't have a lot to do when on orbit, or in space. I mean, there's no real goal (economic, scientific, role play...). And UCGO's loss with Orbiter 2016 made some damages. Alternative solutions are coming, and we'll soon have a bit of survival gamelay. And i've spent hundreds of hours in Orbiter 2010 with those UMmu, and it was enough. Because Orbiter is so hard to master that a light touch of survival was enough to provide the fun. Orbiter is a simulator, and as such, doesn't need natively any gameplay. But we are big kids, we want to play with this wonderful toy and playground. For free. If someone wants to have fun in some kind of space, go for KSP. I've had tons of good moments with it. If someone wants to learn about real spaceflight, run Orbiter. If someone wants both, play both. One will never become the other. How many sales if KSP becomes as complex as Orbiter ? Who would spend money for Orbiter ? A "game" where you have to open files in notepad to make custom missions ??? We can compare with wargames : the easyer the cheaper. Because complexity isn't good for business.