Again, this is not done for legal reasons, blame Mojang. However gradle can do all of this for you with 1 command 'gradlew setupDecompWorkspace eclipse'
In conclusion your points are invalid and you're just bitching, stop.
this is as easy as it gets, deal with it IT IS ONE LINE. you want a fairy to drop out the sky and type it in for you
edit : and even if it was 20 lines to set it up it is nothing compared to the mods you are writing
note you can type gradle --gui to get a gui so you can click things
and how it "making a new modloader" going to make things better. you still need to install the thing you still need to "put file in folder"