[@Willy Vereb] Does everything have to be exact sciences and follow the exact laws of phsyics as we know them to be fun? Since I doubt people would enjoy having to look through wikipedia pages to learn it or have to spend a good deal of time on their things only to be told "guess what that doesn't work lol, gg try again later".

Besides, with handwavium you can get a lot more cool stuff in. There's a reason why things like Star Wars/Star Trek/40k/Mass Effect are so popular even if they don't listen to Newton.