There are rules of construction as in building a house. A house must have doors but the uniqueness of the doors (or lack of) is in the hands of the designer. There are myriad possibilites: so the basic laws of construction are not the least limitation on the level of creativity in presenting the doors.
Who wants a beautifully painted door that doesn't work? We all know what it is to write a passage of music that doesn't work in some way. Much of the problem with untrained composers is that their music doesn't work. It is poorly constructed (sounds poor.) People argue that this is subjective yet they would not tolerate a bathroom fixture that doesn't work, like a toilet: which is where a lot of badly written music belongs.
Who wants a beautifully painted door that doesn't work? We all know what it is to write a passage of music that doesn't work in some way. Much of the problem with untrained composers is that their music doesn't work. It is poorly constructed (sounds poor.) People argue that this is subjective yet they would not tolerate a bathroom fixture that doesn't work, like a toilet: which is where a lot of badly written music belongs.