You're arguing two separate issues. 1) open up OP_RETURN and let the fer market decide rather than let the nodes filter transactions, and 2) the vbyte discount distorts the market price. I am not addressing issue (2) because it's irrelevant to issue (1). Changing (2) does not fix (1). You're essentially parroting a variant of core's position that spam should be handled by the market price of blockchain space. That's like saying "let the bandwidth of your email server limit the amount of spam that can get into your inbox, and all you need to do is increase the amount of good emails to crowd out the bad emails.