“but ‘spammers’ can just submit their OP_RETURN transactions to mara pool”

no, that’s NOT true.

mara is only 7% of the total bitcoin hashrate. they find a block every TWO HOURS on average, and due to variability it could sometimes take much longer

i can’t think of many protocols that would be ok (and survive for very long) with only posting data once every 2 hours (sometimes once per 12 hours!)

MAYBE some proposed mechanisms (like citrea’s) wouldn’t need frequent data posting. i didn’t look. if that’s the case, good for them! but it doesn’t matter.

op_return relay policies currently successfully prohibit the types of hypothetical protocols that WOULD use op_return to fill every single block. removing the limits is going to open up the design space for THOSE kind of protocols

that doesn’t mean they’ll necessarily be built or become successful but it certainly makes them a possibility, and currently those are NOT a possibility

this debate has really been kind of shallow. why not talk to people who have experience in building such protocols (ordinals community?) before proposing disruptive changes? we might’ve been able to tell you this in advance

(we care about bitcoin too you know)