I wrote: "One could invent any number of scales with various combinations of intervals."

And people have. There's a famous book by Nicolas Slonimsky called "A Thesaurus of Scales and Musical Patterns". He worked out lots of different scales (and musical patterns) using different methods. I practiced them a bit, but got bored with it, because none of them sounded much better or worse than any of the others. This isn't a criticism of the book; it could be fascinating, if approached differently. I've just been practicing other things.

That's the way scales and chords are: a harmony by itself is nothing, it needs to be used in a musical situation. That usually means attached to a melody.