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in the case of these problematic UTXOs, it's not the metaprotocol that's the problem. meta protocol is (as you've suggested) just JSON formatting, indicating what kind of message we're looking at.
the issue of the "spam" is not the JSON. it's that there's a bunch of data embedded in witness, which is part of the UTXO and needs to stay in RAM in order to validate incoming blocks. since the UTXO is unspent validation requires that the node keeps track of this information. that is what's filling up the RAM of the computers operating validating nodes.
I was under the impression... that witness script in op_if op_endif was unreachable, in other words the computer just ignored large blocks of op_if of_endif freeing up resources.
Large inscriptions... make large blocks easier to verify rather than harder. No?
The image file, the 'ordinal theory' is the metaprotocol. None of this stuff exists, either it's baseless speculation on data you don't "own" or it's an attack neither of which bip-110 fundamentally fixes.
That's why I do not support it.