You can second-guess the current state of the literature on junk dna all you want but unless you have a research budget it's a bit meaningless.

Also, I never said, and no scientist said, it was THE SINGLE AND ONLY mechanism influencing gene expression. Nobody also ever said the fact the "junk" is preserved was the CONCLUSIVE AND DEFINITIVE PROOF that it does something. Just that it's a good indicator.

You're not really responding to what the current hypotheses are.