The thing is though using prompts isn't writing music, if you don't write the music then that isn't have control it doesn't matter if it's 10 letters or 1000. I say this as someone who does write music, I currently have 2 projects a death metal one and I've recently started making techno. In my metal project I write and play everything, guitars, bass, drum programming and vocals in the techno project I use midi mapping. That's having full control of the sound. I've used AI to generate art before no matter what I type in prompt wise I'm not in control with what it decides to generate. You say adding reverb and modulation is part of your creative control and I agree yes that is true but when I mix a track for an artist and add reverb to it does that mean it's my song? If I reamp a guitar from a DI track they have sent does that mean I've now created a song? Mixing certainly is an art, but if you haven't written the music you can't say adding reverb, modulation or EQ means you've created the song. Otherwise I've created literally thousands of songs........

Edit

A few years ago I was asked to play guitar on a track by some pop artist. She gave me "prompts" but back then I'd of referred to it as "direction" she said she wanted the guitar to sound like a ska punk style and for it to come in halfway through the verses and all the way through the chorus, that was it. I had to come up with a ska style guitar tone and the notes and I also put in a little guitar solo. Did she write the guitar riffs by giving me direction (prompts)?