And yea, if you thought maybe we're looking for alternatives as Luke is clearly on the 110 bandwagon, you're not wrong. Turns out creating a new node implementation isn't trivial though. Besides, for now, v29 does what it's supposed to.
I care less about op_return than BRC20's, ordinals, inscriptions, runes, and stamps anyway. Op_return is relatively harmless noise. No reason to make it huge but it was always a harm reduction measure.
A better approach to disincentivizing spam would be removal of the segwit discount. But we're too wrapped up in retarded alternatives for that to be worth talking about.