That argument assumes restrictive OP_RETURN causes worse storage methods. But BIP-110 addresses both: Rule 7 specifically targets the "more harmful ways" - it patches CVE-2023-50428, which stops data embedding in Tapscript witness space (the "fake public key" workaround) with 99.8% precision and ze...

with bip 110 they would have to split their data across many different chunks and pay way more in fees. And people spamming with inscriptions are not even using op_return, so opening up op_return is just one more data option to spam, it's not replacing another form.