You can already store up to 4MB in witness data.
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Yup, though the purpose of witness, afaik, is for signing and financial related data for effeciency, not for arbitrary like op return, though arbitrary data can be stored in witness, and with that said, knots may have default filters as well to include transactions with witness but not ones with non-transaction-purposed data (which I think they're doing but I'm not sure). I'd agree with this approach as well.