Twinsanity is a hard game to begin with and we for sure ain't adding NoOoB categories. You aren't forced to learn everything at once. See what tricks you are comfortable with or ones that you struggle at. Leave some for the time being and do runs. After some time you can come back to what you were struggling with to understand it better or ask people around for help, if it still causes trouble learning. Just keep learning more stuff when you get better and better and eventually you will find yourself doing all OoBs and skips without too much trouble.

Yeah, No OoB just makes the game far less fun/interesting and pretty much nobody would run it over the other main/misc categories. You can always not learn certain strats to start out with and slowly incorporate them over time. It will make the game much more manageable to learn and make you far less frustrated early on.

Also, to point it out, adding arbitrary categories when there's already All Levels is kinda pointless. The game is a lot more fun with glitches and OoBs as well.