The "lost the plot" part was directed at the note I replied to. Obviously all nodes being full nodes is not bad for decentralization. I think/hope your rationale is -- if all nodes HAVE to be full nodes --> there would be fewer full nodes --> which would be bad for decentralisation. But your phrasing is easily misinterpreted to something that sounds like people should prefer to run pruned nodes. Thats the way I read it the first time. My point with respecting the signal from a substantial amount of noderunners is, since the problem the proposed change seeks to fix and the response is as controversial as it is, no change should be implemented. A better fix should be given time to be thought of.

Utxo spam which is cheaper to produce will not go away because you invited op return spam, you will get more of both.