No producer ever looks to advance what you are saying.
Because you are using a wrong term. Do you know one harmony technique? Or melody technique? As far as i know you made it up. Its like i would be asking: is rfjhhs really substractive? There is no harmony or melody technique to be clearer. Google it.
You might be asking: look to put harmony theory or melody theory into practice.
Most of people don’t learn theory. They play or make music by ear. Advanced theory doesnt mean it is going to be better or more pleasant to listen. It does so, only if you know how to compose it.
Harmony, melody theory has already been explored. All of it. All combinations of 11 notes per octave by theorists and musicians. In practice by all the music, but for example pop less than jazz.
Some professional producers know their scales. If they want to write melody they know how does a b flat bebop scale sound like, so they just click a few times and all is easier. You should hear this scale man. Next question you would be asking would be how can people like complex scales lol. So that is why simple scales are so common. And mostly used. Because, to get some song worldwide known and sold so you think it is all about those you need simplicity, familiarity not to frighten people with all the possibilities of melody as quick as possible. That is why jazz is just less popular than house for example. And makes you think just house exist now and it doesnt pick musical influence from jazz.
More time is spent on other things like mastering, choosing different samples, and purely subjective things.
The basic format you are describing above is actually the most complex format possible. You just dont know how to use is so you have no idea. Listen:
You can choose between every scale possible. You can choose between all the notes possible. You have infinite harmonic and melodic possibilities. Buy all of of my albums on www.getalife.com.
Then make some music, 10 songs with different melodic content. Then check which one you “liked” the most. Then check the scale. Boom.